Building a new studio room

Hi everyone. This is my first post in here.

We are looking to build a new room at our current studio. Our set up is mainly software based eg. Mac running logic, Mackie hr824 speakers, midi keyboard and a few other bit like maschine.

The max size of the room we can build is W-3.4, H-2.4, L-4.8

Soundproofing isn't an issue as the building is out the way of everything.

We were thinking of building stud walls clad both sides in 18mm ply, filled with rockwool then maybe a layer of plasterboard and skimmed or carpeted.

We have looked on various sites but can't seem to find anything about room sizes.

Is this size room going to create a decent listening environment, of course with the correct acoustic foam and bass traps added.

Any info on this would be greatly appreciated.

Many thanks