help nwith drum booth design

Hi, I want to convert one room in my studio for a drum booth, to be able to get great insulation when recording a band together, the room is 4.5mx5m celling is slanted starting from 3m (actual ceiling) to ca. 3.2m. can it be done without sounding boxy? should I aim to make it dead sounding?more hard wood reflecting/material? how should I build the floor for maximum isolation with the other room (which has a floating floor) and especially the neighbours under? a plan of the studio attached thanks a lot

bump with news ideas please comment

that looks nice and spacious. i'd probably err on the side of making it more lively by adding more broadband slat resonators and but keep the ceiling somewhat/slightly more absorptive since you have a wooden floor (in the design). if its too live for a particular track you could cover the slats with some heavy drapes to cut the highs, or use some free standing absorbers.

I need help :?