how could you have changed it from 15mm to 17mm spacing on that neck with that much space outside the G and B strings still? I can't imagine that you added an entire 8mm, nearly a centimeter, roughly a third of an inch, to the overall string width, and have it still fit so similarly looking on the neck.
If that's true then the "before" pic must be misleading somehow because I sure don't see much difference in the outer string-to-fretboard-edge between before and after.
ALL THAT BEING SAID, This is a totally awesome thing you're doing, I LOVE the bridge, LOVE The pickguard, LOVE the preamp addon/upgrade.
So good to see!
Personally I am totally enjoying my cheapo ibanez bass, it's my main bass now besides my carvin fretless. I love my fully stock crappy old sr300 with proper setup (Which I think is nearly never done, specially regarding the pickup angles/heights and choice of strings for the bass).
If I ever did an upgrade it would probably be new pots because the current ones are pretty scratchy, but I also don't have any de-oxit so maybe if I did they could be cleaned up.
That's about it though.
insane basses... WAY WAY WAY better than they should be. I like it so much I've been selling off my much heavier, less comfortable, much higher quality big name basses. I'm not kidding.
the bridge and so on with my bass is actually pretty good. sustain is good, intonation is perfect (after I set it up), action is quite low although a spec buzzy (the frets are not super well finished or even, I'll say that about the cheapness), and it sounds so good you'd all be pretty shocked compared to other sr-300 basses of any year, I bet ya.
If price was no object, I might just do some upgrades like you're doing... possibly even change it from 4 to 5 strings.... not sure it could hold up though.