Been there, done that! And it did come out very good….
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I went el cheapo on the pickups (Chinabuckers) because this was just a proof of concept. But in experimenting around with pup locations I found this spacing gave the broadest spread in tonal range. Neck soloed is darn near a Gibson Mudbucker (with an over wound pup it would be spot on). Center pup follows the Fender split P location for that nice deep round tone and bridge pup follows the Fender Jazz location for a bit of burp and grind. Here’s the spacing template laid over a Telecaster, a FSO PJ and a Greco…
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I went with a dedicated tone pot for each pup to maximize the differences, so turn on all three pups and adjust the tone pots to where you want them and it’s nearly like having 2 or 3 bass players all tracking at the same time. Very interesting sound, very hifi with all three on. The next step will be to replace each pup with a purpose built unit (30k Gibby Mudbucker copy in a Tbird can if possible + a Lull Tbird bridge pup in the center spot and a special hot wound splittable humbucker in a Tbird can for the bridge (so I can maximize that Jazz bark if wanted). Will probably run north of about $800 for the set if I go that route, that’s the problem with 3 pup basses, they ain’t cheap, and add to that Gold cans and rings and the options disappear quick while the price goes up even more. But certainly a fun build.