Acoustic Guitar Construction

Got a top jointed and joined. After preliminary thicknessing I decided it was borderline for the project at hand (at least for my skill level), so I set it aside and decided to select another top.
I think the "reject" would still be a great top for another type of project; for instance, something smaller.

This got me thinking (usually dangerous). Does anybody process their tops ahead of the actual project?
Not really something I plan on doing; just wonderin'.
Pros? Cons?

What I have found, in my situation where I can not control the temp and humidity where I store my wood, I'm better off leaving the tops in there "as received" thickness as the more wood is there, the more stable the tops seem to remain. If you have a controlled environment to keep them, then it is probably fine to join, thickness, and probably even brace if you are sure how you will be using the tops.

Kevin