Need help as an amateur builder

[Kzmiflwrs]

I'm looking for any pointers towards the framing of my currently planned build which is a studio with dimensions of 340 cm long × 206 cm wide × 209 cm high. (I am sadly aware of How awfully small the space is, but it's the only place I can build from scratch) the walls are planned to have interior framing with insulation, 2 layers of interior drywall and 1 layer of exterior drywall, with joints and gaps sealed to reduce sound leakage. I'm not able to expand on the sides much. I got the drywall for free. I'm planning to use rc1 strips for connecting the drywall to also reduce vibrations. Is there any improvements I could make or should keep in mind ?. I'm aware is an extremely inclosed space but I'm trying to do the best with what I have. I'll be mainly using it to record drums and guitars as well as some minor engineering and production using iems. Any help in this planning stage is greatly appreciated.