In your opinions, is taking a body from a previous guitar and slapping a new neck on it any worse than buying a body and neck from the same builder and slapping them together?
I've slapped together a neck and a body from different builders but on my next project I don't know if playability will be better/worse on a guitar with a new neck or two recently built pieces from a shop
I don't see anything wrong with it. It will depend upon how well the two parts come together and how well it plays after. If it works, then you have a good thing!