I have an MIM sunburst jazz bass, I recently got a black pickguard for it. There are some other mods that I want to get for it. Which are:
1. Fender Thumb-rest. To be installed in the 70's position, so its actually a thumb rest.
2. Dimarzio DP123 Model J pickups. So I can have no noise and more thump.

3. Hipshot Bt7 extender key.
Now those don't seem to be unreasonable. But there are some other mods that I want to add for aesthetics, but I'm not sure if its possible.
Can I get a maple neck from allparts or warmoth to replace the stock rosewood one? I've heard that their necks won't fit an MIM bass. Is that true? I was hoping to eventually swap the neck for a maple one. 'cause maple neck + sunburst + black pickguard = one sexy bass.