Studio Construction in Phases?

Hello to everybody. I couldn't seem to locate another post that was similar to mine so here I am. - I have a 12'x15' bedroom in my home. 8' ceiling. 1 door. 1 closet. 1 window. - 2 of the room's walls are exterior walls on the house. - I live in Arizona, U.S.A. - I have about $3,500 U.S. to spend for phase 1 - I would like to have a room that I can achieve a great mix in. - Most work will be jingles, songwriter demos, my own little band. - Would like to be able to track live vocals, acoustic guitars, and drums. - Most electric guitars and keyboards will record direct. - My neighbors are nice, but are close. I will only be tracking drums during daylight hours. - I am up for doing remodeling, which I will do all of myself - The room can be extend from 15' to 20' if that would make a great improvement. - Would like to sell the house in 10 years and be able to have the room look like a normal bedroom, for the most part. I am looking for advice on what my room may need to get me a great room for mixing in and also do some good recording. The posts I have read seem to cover very basic rooms or full blown studios. But I would like to find out how I could break my construction up into phases. Phase one resulting in a nice home recording studio, phase two a nice low end commercial studio quality, and phase three nearly professional quality. Each phase should pick up where the last phased stopped and continue on with the construction. In between phases I would like to do some recordings until I save the money for the next phase. I just don't know what should be done in the first phase, then second and third phase. Thanks, Brett

well for 3500 you could build a complete control room at current lumber prices. My materials cost was 1500 for my control room. Which was in a 13 x 11 room. I have acheived some great mixes out of this room. If constructed wisely you can build a room that when taken down would leave your bedroom with minor repairs to the drywall at worst. I did not attach my room to the room it is in. All walls and ceilings were "floated with neoprene top/bottom/sides. (The stud wall I built. The drywall fitted into place and edges sealed. So if I shose to take it apart, i could easily rip out all the dry wall down to the stud frame and then cut the studs and remove the framing leaving the room reasonably intact. The acoustics of my control room lend to getting great vocals if need be, etc...... I doubt I would wanna cut drums in there. Way too loud to be sitting in front of my DAW and recording drums. LOL. But everything else goes down well. You could even get a nice acoustic sound keep those Hard Drives silent....) Look in the other studios forum I just posted a link a photographer took of my room.