Laying out and Treating First Decent Sized Room

Hey my names Dave, Ive used this forum for years now and it has helped me treat and setup a few different home studio setups of mine. I have finally found a commercial space to rent thats a decent size and I want to set it up the best I can. Its only a tenant at will lease for now so i can feel out the neighbors and road noise. Its on the second floor but most other tenants will be closed when im there. The space will be used to record full live bands playing everything from acoustic to hard rock for personal use mostly but may have a paying client occasionaly. Budget is very tight , trying to spend as little as possible . Any suggestions would be much appreciated , Thanks in advance ISOLATION is going to be important but im trying to put as little money into it as possible until i sign a full lease, I completely understand true isolation isnt cheap or easy but any suggestions would help. I was considering making some sort of mdf/fiberglass panels to cover windows. Im on the second floor so i know a floating floor isnt an option for me, Ive read that drum risers wont do anything for isolation but im thinking it would help with the direct impact sound. CONSTRUCTION. To keep it simple im starting with a one room studio idea with mabe one iso booth(whisper room or john sayers vocal booth). Im not opposed to building a wall if it wont hurt the sound of the room too much and can be done for reasonably cheap. All walls are 1/2" sheetrock with standard isulation and plywood/siding on the outside. Trying to avoid constucting anything that cant be taken apart and reused if this space doesnt work out in the long run. LAYOUT/TREATMENT. If I stick with the one room studio idea Im assuming that the monitors will be opposite the stairs firing the long way down the room. I would really like to try to record drums under the 11.5ft ceiling unless the 7.5ft area is too small to get a decent result as the mix position. I have some rockwool and fiberglass panels/clouds ready to go and i fully understand how to create an RFZ around the mix position. Im considering building some QRD diffusers if the room is large enough to make them work but not sure where the best placement would be. I have room Room EQ wizard and a measurment mic, i will post some measurements as soon as i have a general layout. Questions Is there any benefit at all to putting the drums on a solid riser with sorbethane decouping? Could the lack of symetry where the monitors may be cause any issues? Would MDF panels with a Weatherseal over the windows help with isolation? Could the room be divided in two and still have a great sound? Whats the best way to treat the vaulted ceiling? Where would be the best place for the mix position,iso booth and live area? Would the room benefit from QRD/PRD diffusers? Which "N" to build? And where to put them?