My feeling is this: You won't know how it sounds unless you try it, but because it's unusual, it will necessitate additional work to make it since there aren't any standard design plans available. You also need to consider that you may have trouble getting a set of boards of the right dimensions for that big lower bout at a reasonable price. I think the extra surface area could give you some improved bass response, maybe - but the corresponding chopped-off upper bout (that's a BIG cutaway you're imagining) might lose you some higher-frequency response. Totally speculating here, of course. That said: If you install a high-quality pickup/mic system, you may be able to come up with a serviceable amplified tone no matter what the axe sounds like un-aided. If you think it will be fun, and a good learning experience, go for it. But plan also to get a lot of raised eyebrows and/or reflexive rejection (kinda like what you've run into already on this thread).