I'll always say use what you have to make what you want. Then again, it depends on the hardware on the guitar too. No point putting a slick neck and quality electronics and pickups only for the thing to never hold tune, break strings constantly and suck the depth out of your tone due to a crappy bridge. Then by the time you buy the new hardware and everything else, you've spent as much as buying a warmoth body or better quality secondhand body with hardware attached.
Me personally if I were in a similar situation, would either buy a whole guitar or purchase better quality parts including a body if I wanted something unique or to fill a particular need.
Me personally if I were in a similar situation, would either buy a whole guitar or purchase better quality parts including a body if I wanted something unique or to fill a particular need.