Studio Design Ideas for me...

I will be putting a studio in an old cabinet shop next to my house in the near future. It is make of logs, and has only one room inside. The walls are the actual logs of the structure, as is the outside. I will need to do quite a bit of work on this. The floor has wood subflooring, and some of it you can look down and see the ground. The floor is very strong though. The ceiling is just the log roof forming a V. Deminsions are 20'L and 18'W. There is a door on each 18' wall. The main entrance (left side) is in the middle of the building. The back door is on the far left side if you are looking from the main entrace into the room. Does anyone have any ideas on what to do with this area? I would mainly be recording rock groups and gospel groups. I would like to be able to record everyone at the same time if this would be possible in this building. Let me know what you guys think. Thanks Jason