Well as long as HiFi is not your thing.
Without even reading about it, I can say that obviously the larger the board the lower the frequency response. Try mounting it on a low quality hollow room door and see how much bass it can reproduce. A circle would look nicer than a square or rectangle and the thinner the board the higher the efficiency I would imagine.
A circle may also provide a more linear reproduction or better said: less likely to cause unwanted resonance effects but every vibrating piece of wood has it's own resonance frequencies which is the reason why the walls of better speaker cabinets are constructed so solid that they can't vibrate at all.
Offsetting the position of the exciter may reduce resonance effects too.
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