Lija, what do you think about putting him in a long reptile tank, 20 gal or more? He should have lots of room to crawl around but at his weight I wouldn't even encourage climbing (even if he could) as he could fall and get further injured. Maybe larger round smooth rocks or logs to climb over (but nothing he could get stuck or wedged in) and a shallow easy entry watering receptacle... I want to see this guy get well!
http://www.petco.com/product/125390/Petco-Reptile-Ramp-Bowl.aspx