SO...
I can have 3/8"-1/2" sides & back, and it wouldn't effect the overall sound because the acoustic part is driven by the vibrations of the top.
The sides/back of an acoustic are braced because of the thickness (or lack thereof) of the wood.
Therefore I can have an 1/8" top and not have to worry about bracing, right? The only caveat is that I cannot have a block under the bridge because it'd dampen the vibrations.
If I have thicker back & sides and a thin top WITHOUT a block under the bridge, what does that do in regards to the security of the bridge? Say there's a screwed-on tailpiece. Would there be enough transfer of energy? What about an archtop style? I couldn't see there being enough wood to securely hold a TOM, so whatever is used, it might have to be secured somehow other than posts/bushings.
I just measured my semi acoustic electric guitar. The top is .128 of an inch. .125 is 1/8th. I haven't had any problems with it. The top is the same thickness as my acoustic. Mine appears to have a solid block running from top to bottom of the body holding the pickups and the bridge. I think you will get feedback problems with no center block but i am no expert.