Take a look at
http://www.skoolie.net/forum/viewtop...it=door#p59755. I used 2x4's to shim out the opening to hold a smaller door. You might do something with smaller wood like 1x3's or 1x4's. As for being level, a big square can do the trick if you're just trying to make sure the frame doesn't pinch the door.
Linear Mode
