Here's just a showcase search on guitar bodies, with swap ash to get an idea.
1 piece bodies will state that they are.
Guitars .... http://www.warmoth.com/Pages/ClassicShowcase.aspx?Body=2&Path=Spotlight&core=2
Bass ...... http://www.warmoth.com/Pages/ClassicShowcase.aspx?Body=2&Bass=1&Path=Spotlight&core=2
If your going clear finish and are real fussy on the outcome.
:dontknow: I'd probably go the 1 piece.
Think I know what your getting at here.
Especially using a clear finish, as you don't won't one side slightly darker, or a not such a good match. :sad1:
But, from a lot I've seen, they do a pretty bloody good match up.
You can ask or specify what your after, they are very good to deal with. :headbang:
Actually they are the best to deal with. :icon_thumright: