> with the center block notched between the neck and bridge to the depth of a P-90 route to connect the two cavities (will hopefully lower the resonant frequency) and allow the top to do it's thing.

:huh


> How does the tone, stability, etc. compare to maple??

Slightly more mids. Better, which is why it doesn't have to be finished.

Remember, goncalo will be significantly more expensive than maple, and that USACG does not have a ready supply of goncalo.