Ideas that you are curious about. I'll start: How would a two ply laminate spruce soundboard impact a guitar structurally and soundwise if the grain on top was parallel to the neck and the one underneath was at a 45 degree angle? Also, what would be the effects of a soundboard with the grain running perpendicular to the neck?
Check this out: Yep, you can do it. This Tilton modified guitar from Jake Wildwood's blog is interesting for a lot of reasons. The neck angle is very shallow and the bridge is a trapeze bridge, so the top can be quite a bit more flexible than a normal guitar top which has to withstand torque and tension as well. So it's similar to this: http://www.herbtaylor.com/instruments/bouzouki/i154/ But, since the cross-grain strength is significantly less than stiffness along the grain, you will actually be making an instrument which is weaker than a solid top would be. You can make it structurally sound, but it will probably be pretty quiet. It might sound good, but it probably wouldn't be as responsive. Laminated tops are frequently used in semihollow electrics because they aren't as responsive (of course, those are made of maple, mahogany, Obeechee, or something like that, not spruce, generally).
