Got a little more done on the wall.. taking long breaks between working on this thing.
Plan is to finish the wall sooner than later, build a shelf in the back of the bus attached to the wall(s), and then carpet both sides of the wall for a little extra sound deadening.
On another note, found out that most of my windows are leaking to the inside. This has caused the front corner of the floor to rot pretty badly.. it's a little scary to walk on now. Not sure if I feel like ripping the entire floor out to repair or just patch it for now.. or just leave it. Looking like I'll leave it for now. Oh well.