Thank you for contributing everyone! I'll try to answer all comments and questions as best and as thoroughly as I can. Please keep 'em coming! 
Your "JazzRay" thread is one of the first I came across when I started my initial research. It, and a couple other threads, helped me decide to co-opt the nickname.
Too bad I discovered it before I started digging around TalkBass. I would've encouraged you to skip the pickguard. I mean, that body is sooooooo smooth and shiny!
It reminds me of a lake of unmarred, polished obsidian. Ah well… 
I'll definitely be discussing anything I learn here with my local guitar tech. (Let's call him "Mike" for the duration of this thread.) He's the one who will be doing anything involving power tools…routing, wiring, drilling, etc. He's the one who did the dirty work to turn my aforementioned Jazz bass project into a P/J configuration.
On a side-note, I've even considered having Mike just route out a square-ish section underneath the pickguard. Then we'd trace out silhouettes for each style of neck-side pickup I could ever want…spots for a Jazz, a Music Man and two different Precision positions (Blacktop and Reggie Hamilton-sig). I could even use different color markers for each, individual pickup position to "color code" them. All I'd need for a quick swap would be the pickup and the proper pickguard. (Another side-benefit…reduced weight, like that of a chambered body!)
When I first asked Mike, "Someday, could we take some time to measure out the proper distances from bridge to pickups to neck (obviously, re-justified to account for a 20-fret neck) for this possible project?", he said it wouldn't be a problem. But he also added it wasn't just positioning that's important. It's the preamp that gives a Music Man bass it's distinctive sound. Otherwise, it's just a bass with two humbuckers. So far, he's never steered me wrong and has proven time and again that he knows his s#!t.
I had the opposite problem with the initial pickup choices I made on my last project. If you follow the link and look at the first round of pics, you'll see I used a Quarter Pounder P-pup alongside a Fender Super 55. The QP overwhelmed the 55 and made the overall sound too bright/clacky and robbed it of the inherit P/J versatility. It wasn't a good combination. It was solved when I got an MIJ standard Precision pickup. Now, it has a much, much more balanced sonic palette.
To avoid such "overwhelminess", I think I'd like to stick to two matched MM-style pickups. I started looking at the Nordstrand site, and as tempting many of their choices are, for the time being, I think I'd rather stick with something akin to their MM4.2's. That's where my head is at the moment, but who knows? I just might change my mind down the road or find something similar, but at a lower cost. I mean, I did say I'm looking to go "not too expensive" for my first go-around with this project, and one of those Nordy's costs more than I paid for the brand-new body. Besides, if the finished product isn't a total disaster, I can always buy a couple over time and replace when possible.

When you say "JazzRay", I immediately go here:
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Slap some humbuckers in there and away you go! (Though I like the idea of the singles myself.)
Your "JazzRay" thread is one of the first I came across when I started my initial research. It, and a couple other threads, helped me decide to co-opt the nickname.
Too bad I discovered it before I started digging around TalkBass. I would've encouraged you to skip the pickguard. I mean, that body is sooooooo smooth and shiny!

That Delano MM pu with the j coil in the rear would make an interesting combo with a P pu. I'm not sure of the spacing but I wonder if its possible to keep the P pickup in the correct position and have the MM pickup in the correct position with the rear coil of the MM pickup near where a J bass pickup would be? 3 basses in one?
I'll definitely be discussing anything I learn here with my local guitar tech. (Let's call him "Mike" for the duration of this thread.) He's the one who will be doing anything involving power tools…routing, wiring, drilling, etc. He's the one who did the dirty work to turn my aforementioned Jazz bass project into a P/J configuration.
On a side-note, I've even considered having Mike just route out a square-ish section underneath the pickguard. Then we'd trace out silhouettes for each style of neck-side pickup I could ever want…spots for a Jazz, a Music Man and two different Precision positions (Blacktop and Reggie Hamilton-sig). I could even use different color markers for each, individual pickup position to "color code" them. All I'd need for a quick swap would be the pickup and the proper pickguard. (Another side-benefit…reduced weight, like that of a chambered body!)
I built something along these lines using a combination of Guitar Fetish and Squier Classic Vibe parts, turned out pretty good but not great, it's all passive with a volume, blend, tone setup with a coil tap on the mm pickup, I feel like it could benefit from an active preamp
View attachment 679963
When I first asked Mike, "Someday, could we take some time to measure out the proper distances from bridge to pickups to neck (obviously, re-justified to account for a 20-fret neck) for this possible project?", he said it wouldn't be a problem. But he also added it wasn't just positioning that's important. It's the preamp that gives a Music Man bass it's distinctive sound. Otherwise, it's just a bass with two humbuckers. So far, he's never steered me wrong and has proven time and again that he knows his s#!t.
I have a friend whose main bass is an 80s MIJ P Bass. When he got it, it had a G & L humbucker installed in the bridge position. He said it sounded great, but it over powered the stock pickup; it sounded like crap. He replaced it with a Duncan Quarter Pounder. Then it sounded great.
The QP had enough output to balance the humbucker, so they sounded good together, and when he used just the P pickup, he didn't have to contend with a significant volume drop. The tone of the two pickups was huge.
I'm not sure what kind of front pickup you want to use, but I just thought I'd throw that out there. I like the suggestion about using a Nordstrand big single.
(btw, another friend of mine has ordered a Nordstrand big single, that he is going to put in his single pu Jaguar bass. I'm looking forward to hearing it when he's done. It will be mounted in the MM 'sweet spot')
I had the opposite problem with the initial pickup choices I made on my last project. If you follow the link and look at the first round of pics, you'll see I used a Quarter Pounder P-pup alongside a Fender Super 55. The QP overwhelmed the 55 and made the overall sound too bright/clacky and robbed it of the inherit P/J versatility. It wasn't a good combination. It was solved when I got an MIJ standard Precision pickup. Now, it has a much, much more balanced sonic palette.
To avoid such "overwhelminess", I think I'd like to stick to two matched MM-style pickups. I started looking at the Nordstrand site, and as tempting many of their choices are, for the time being, I think I'd rather stick with something akin to their MM4.2's. That's where my head is at the moment, but who knows? I just might change my mind down the road or find something similar, but at a lower cost. I mean, I did say I'm looking to go "not too expensive" for my first go-around with this project, and one of those Nordy's costs more than I paid for the brand-new body. Besides, if the finished product isn't a total disaster, I can always buy a couple over time and replace when possible.

But considering what you say about the S.U.B.'s pickup wiring and performance, and if it's echoed by enough people, I think I can scratch that off the list of possibilities.
