A koa top would be a little questionable as far as stability goes, especially if you make it out of a "fancy" cut. I've found that the best sounding koa wood on Weisenborne Hawaiian guitars is the straight-grained plain stuff. It's really stable and strong if the run-out (fibers that start at one end of the board and go all the way to the other end) is consistent. A carved koa top is pretty much an unknown. But, as I recently experienced, sometimes these experiments don't work out and you still have to pay for them anyway. Living with a $3000. mistake can be painful. And a lot of makers will go for it whether it's a good idea or not because they want to see if it's going to work as much as you do..............and you still have to pay them. Koa back and sides is a great idea and will definitely sound good if it's done right. You can always put in pickup in something that's an accoustic dog and it can sound amazingly good as an electric instrument. Good luck. D.L.