3 pickup bass - 2 Tb+ & 1 Model G

[Iome]

I'm still working on my lefty FenderBird which i have a DiMarzio Model G for, now i've got a pair of Gibson Tb+ Pickups (latest version i think) that i wanted to throw in another homebuild bass. Anyway, i'm not interested in having a flok of basses so i was thinking about changing the bass into a tree pickup monster. Does anybody have suggestions about how to position the pickups? Would the G be usefull right up the neck? Should i move the neck Tb+ a little closer to the neck and put the G in the middle.....? HILFE!