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HELP!, roof/ceiling venting plan, is this an isolation disaster?

I am having a back garden practice/recording cabin built. Structure will be (from outside to inside)

Concrete base with DPM
timber frame (total area 4x5m)
OSB with 18 mm shiplap cladding
4x2in wooden studs
100mm RW3
2 layers of 15mm acoustic plasterboard.

Roof
OSB covered with EPDM

Ideal drywall setup for drum room?

Hi all,

I'm building a drum studio in my garden. It is purpose built, and completely detached from any other building. I have a double stud construction already in position, formatted to make a two-leaf assembly. I will have outer, external layer, insulation, air-gap (1 inch), insulation, inner board, and it's the inner board I'm asking about.