Partitioning a basement "box" studio

Hello, After many years of lurking and doing reading, I am working to take my basement space to the next level. High level goals - currently the space is being used as my rehearsal space for various types of groups. From loud rock and jazz-rock type of groups (primarily instrumental). Consisting of some combination of electric guitar, bass guitar, full drumset, synthesizer keyboards, sax, electric violin ... to acoustic and world music groups featuring sitar, guitar, shakuhachi, pipa, tabla, and various other percussion instruments. I have done some recording in the room, but it has mainly been small overdubs of either electronic or softer acoustic instruments (e.g. pipa or sitar). Moving forward, I would like to be able to record my louder jazz-rock fusion group in this space (https://www.facebook.com/pages/Continuu ... 8121868742). We normally would record with everyone performing together and then maybe some minor overdubs. So it would require being able to all perform together - tracking drums live/mic'd, synthesizers all direct into the board, bass direct into the board, sax would require a mic and enough but not complete isolation (we would typically play through live including solos, and then just overdub minor changes or additions). When we recorded in professional studios, we would typically put the horn into the vocal booth and the rest of us in the main room. I have no mixing board, and am not planning on getting one. All work has moved in the box, and at most moving forward I will have a small hardware controller for the computer. Currently recording as well as doing all of my writing on Apple Logic. I am monitoring through Yamaha HS8's (which replaced my Alesis monitor one's when the power amp blew up last year). I monitor and mix at relatively low volumes. All of my outboard gear which consists primarily of mic rackmount preamps (API, Grace), line mixers, headphone amps, and the computer interface is more than fully handled with the 20 space rack with plenty of room to grow to add a few more outboard pieces in the future. Heating and cooling is working well and I turn off the HVAC when I record. I have only had 5 people recording at one time, so the heat hasn't been an issue, and generally will open the door if the air gets stale between tracking. Also, where I located in Santa Monica, it does not get too hot and always has a breeze, so we don't have to deal with the hot days in Hollywood type of weather (plus we are under ground). I saw some of the HVAC vent projects that people were doing - but I think that is low on my priority list (unless I form a big band). My plan would be to do the work myself as I am experienced and skilled in typical house building and remodeling (and in Santa Monica I can get it all permitted as owner-builder). My budget would be in the $10k (USD) range for construction and materials. Sound isolation is currently great. It is a true underground basement (very rare in the Santa Monica, Los Angeles area). In its current state we can rehearse at any time of the day and nobody will hear anything outside that would be above the typical road noise. Similarly, not outside noise intrusion other than when a car comes into the garage and the garage door opens and shuts. My biggest noise problem is coming from the Mac Pro fan, laptop fans, and amplifier fans. It is a poured concrete box in ground (right below the garage). Floors, walls, and ceiling are all made of poured concrete. I have the old plans of the building, showing all the macro pieces, but not a lot of details on the finishing in the basement. The walls appear to be 5/8" gypsum board with some small standoff from the concrete walls - so no exposed conduits, or electrical boxes, etc. The ceiling also appears to be similar 5/8" gypsum - lights are NOT recessed, but all sprinklers and wiring is behind the gypsum board. The floors are wall to wall carpeted (medium short nap home carpeting) and are slightly raised off the concrete (based on the entry being concrete of inches below the carpeted floor). There is no acoustic treatment done to the room - no bass traps, clouds, etc. I have attached a drawing of the room in the attached PDF. The sound in the room is a little woofy sounding, with some peaky-ness in the bass frequencies. This seems to be accentuated when the drumset is setup in the corner. It doesn't sound to dead or live and is rather pleasant even with the wall to wall carpeting on the floor. My priorities are: 1. Formalize the layout of the room so it doesn't just feel like I am a floating desk and keyboard setup in the room. 2. Part of #1 is to also create a set of monitor stands 3. Even out the frequency response of the room, tame some of the bass frequencies 4. Create a good environment to record drums at rock levels 5. Build up some isolation so that the drums are leaking into every mic in the room (electric violin amp mic and sax mic) Thanks in Advance, Craig O