Tracking/Mixing Project Room- any help for it?

Do to the robust economy in the Midwest, I will have to make do with the current room I have availble. Attached is diagram of the spare room I wish to use for tracking/mixing. The fixed desk is basiclly a formica corner counter-top mounted on leveled 2X4's lagged into the wall studs w/ 1.5" pipes on flanges for legs. The room will be occupied at a maximum of three adults tracking using head phones and some acoustic guitar mic recording, POD's and vocals. Should I remove the fixed counter, extend the wall absorbers and how would one go about working around the odd shapes of this room. There is currently zero sound treatment. Thanks for any considerations.