I use 2x2's and suspend them from the garage ceiling using simple
hooks. (attach hooks to the end of the 2x2 and the ceiling). I then
use thumbtacks to attach vapour barrier to the 2 by 2's. It's a
little crude but it works well. It allows plenty of light in, and you
don't feel cramped. Also, should you need the space in a hurry (need
to get a vehicle into the garage, etc)...you can remove the "room" in
seconds...either take it down and roll it up, or "accordian" it and
hang all four 2x2's close to the wall.