Re: Kumu four piece.
Beautiful kit! Looks and sound.
I'm not real big on the porting of drum shells, but it doesn't seem to have affected the quality of sound from your kick... I play with a full reso head as well, (and just mic front and back.. I may try the internal mic'ing to see how it goes), because I love a full rich sound from the kick.
Cheers! (and congrats!)