Thanks guys! Darryl - Bobcats are quite the handy little machines indeed!
I ordered some 4mil greenhouse film and it finally showed up today. It is soooo much nicer than the construction stuff I was using. I put most of it on tonight, but forgot my camera. I'll have to finish the job tomorrow and will get pics.
The roof material (including the special screws) was $300! I wanted to do the whole thing with poly sheets, but too much money for now. The new film cost about $70.
Bill, I am excited for you to be building yours. If you are going to go with a film and not the sheets, make sure you get greenhouse film. The other stuff just doesn't last.
All Cacti are succulents, but not all succulents are Cacti