Personally, I'd rather have the J99 single coils over the H50 humbuckers as well. I have them in my SB4000 and have zero problems with noise, even with pickups running solo. They've got more punch and clarity to my ear, but it's a preference.
I've been running with the bridge pickup solo'd, I do get some hum but I don't mind it. I'm finding I like either one pickup full on or the other, mixed it becomes to smooth and jazzy.
and the headstock is kinda fugly to me :scowl: There's an old ATK305 on the bay right now for dirt dirt cheap, it also has the active electronics but if i can score it for around 100$ I would venture out of my way to do a passive conversion.
I honestly have no idea but your more then welcome to come take a look at it, its just a paperweight to me right now. I was considering pulling the trannies out and using them for the Adamos build, but i havent been able to find any info about them online to confirm they would even work for the build.