430SF Ground Floor Area, 200SF second floor area.
Maximize natural light into the building, and views to all directions especially north (main house & fire pit), & North East.
The interior is only illustrative, can be conditioned according to how the band practice are desired. For example, the sofa can be placed in the electric drum area if you want to practice by sitting in a circular format in the middle of the room.
Material can be replaced with materials that is easy to get in your area. We assume that wood is the easiest to obtain and affordable, so we make an alternative with the whole wood. (or with stones).