Basement recording room upgrade

I am a cellist looking to create a better recording space out of my basement studio. This is my teaching space and I need to keep it as open and large as possible, but I would like to optimize the acoustics as much as possible for recording. I don't need to create a truly sound proofed area (don't need to worry about the sound escaping), but I would like to minimize the outside sounds coming in. I am using the space to record acoustic music and loudness isn't an issue to outsiders/neighbors. The room (21Lx14Wx7.5H) has a concrete floor, it had a thin carpet which I've just pulled up and plaster ceiling. The walls are paneling, but I like to pull that down and put up drywall. Two soffits hiding vent work work run the length of the room. I have made bass traps for the corners and several broadband traps for walls. Two of the bass traps are floor to ceiling but the other two could only be about 5' due to a window and a breaker box. Questions: 1. I'm particularly wondering about the benefit acoustically of replacing the paneling with drywall, would angling a side wall be a good plan to minimize parallel wall be smart? 2. What kind of search should I do to see the correct wall construction? Should the framing be lined with Rockwool or fiberglass insulation and then drywall? What effect would two layers of drywall have? 3. The room has an open doorway, which I like for easy access, but would it be best to put in some sort of door? Could it be sliding glass to keep the room looking more open? 4. I'm planning to paint the concrete floor and use removable area carpets. Would a manufactured wood floor create much difference acoustically than the concrete? Thanks for any guidance! Derek

Sorry if my original post was to vague or naive. I've done some good searching on this site and a few others and have a better understanding of what is needed. Goals - Optimize the acoustics for my use; playing and recording cello. - Create a better sounding room - not totally dead/dry if possible. With a small room like this - 7.5' ceilings - I don't know how much if any 'nice' room sound I can get. I'll being recording almost entirely acoustic string instrument, primarily myself on cello. I don't have much concern for the noise I make being an issue outside the space but I would like to minimize any outside noise getting in while recording obviously. Room Size - This is a practice/teaching/rehearsal place as well as a recording space. So I'd like to keep the room as large as possible. With the ceiling already pretty low, i'd like to keep as much of that height as possible. (Aside from putting in a bunch of can lights - with good insulation- I wasn't planning on doing much to the plaster ceilings :shock: ) Due to time and finances, I need to work on the room in shifts and treat the floor, walls, doorway and ceiling as separate jobs. I was planning to begin with the floor and walls. Walls - After researching, it seems that best wall build for my needs might be: A. An inner leaf wall consisting of 2x4 faming filled with 703 and covered on the room side with 3/4 in plywood & two layers of drywall. What would be the effect of leaving out the plywood layer under the drywall? Am I correct that I should put Green Glue between the drywall layers? or B. An inner leaf of 2x4 & 703 with Genie Clips and a single layer of drywall. From what I see, Geinie Clips are designed to hold a single layer of drywall? Door/s - I realize that the open doorway is ridiculous to have if I redo the walls. I'd like to keep the opening as wide as possible. As of now, I'm thinking of making the doors so the size can be custom and a bit cheaper? Any thoughts on which route to take? Is method A going to be far superior? HVAC & ceiling - I'm not really in a position to demo the existing ceiling and redo. Is it stupid to put in the work on the walls if leaving the ceiling? I'm thinking that moving from the thin wood paneling to the inner leaf wall will make a noticeable acoustic difference? As far as the HVAC work along the sides of the room, what would be the best way/design to cover that? Room shape - Should I take this opportunity to change the parallel wall situation? Again, I need to be aware of room size, but should I think of angling the back wall? Or side wall? Thanks for any input! :D Derek

Some pix of the messy, half demoed room:

Some of my current, homemade treatment...

Should I have posted this in the Studio Construction forum?