Help save a studio from becoming a toxic paint sanding shop.

Hi The dimensions of this studio building are 24'x42' and 25' to the peak of the vaulted ceiling. As shown in the jpg below about half of the first story (12' vertical) is taken up by a control room, entry area and stairs to the open loft. The rest of the building is all open. The ceiling is faced with v-match pine, all walls are sheetrock and floors are enamel painted plywood. My main concern or interest in advice is for treating the open recording space to try to control the natural reverb of the space. It is very loud. Im thinking of treating the ceiling with homemade 2" broadband panels and treat some of the corners with 4" panels. I have six 4" panels already and 12 2" faced 705 pieces. I tried recording in this room last week, using said panels and the 705... a three piece group...banjo, resonator guitar and drumset. Tracking live I was able to get reasonable/usable separation between the instruments but the drumset sound had too much "room" in it for the sound we are looking for. I used some of the panels as gobos and everything else either in corners or on the walls. I wasn't able to treat the ceiling. I prefer mid-side micing technique for the overhead/ main drum set sound...though had to switch to close micing and it still wasn't enough. We have no neighbors so this isn't a concern. I don't want the room to be dead I just want it to be controlled. I'm curious to know how much treatment and what kind I should be thinking about...ie broadband, corner bass traps, diffusion, gobos, curtains, etc. Budget under $1000 though just for materials..labor free. thanks joe

By the way this is not my space/building...a friend had it built a few years back hoping to make it into a studio someday...there has been some recording and some music nights hosted here over the years but more recently he has started to use it as a workshop for his house painting business, i.e sanding and painting old green shutters and the like. When this is going on it unusable for music what so ever... I feel like it is a good space and want to rescue it, make it usable for me and others...and to show him how good this space can be. I have good general understanding of what needs to happen though I want to spend my money wisely...I don't have a budget that could afford a professional consultant like John Sayers or Ethan Winer of RealTraps...I wish I could...glad to have their help on line though.. By turning to you I'm trying to reduce some of the guess work. Thanks

hanging 5 2'x4'x4" absorbers about 4' feet off the ceiling right down the middle of the building should help. on the angled ceiling and side walls, some 2" 2'x4' absorbers should cut the echo between walls - stagger them to leave wall space (and save money). for instruments - like drums or guitar amps - build some gobos to put around them.