Awesome!
I built a hoop house style greenhouse out of 10mil plastic and 20' pieces of PVC pipe.
It really didn't do much for me. I gained like 2 weeks of start time on my vegetables, and then by June it was so hot inside that it was cooking my plants and I had to open it up.
I'll just be starting everything inside under a grow light instead. Much easier.
I have people rubbernecking going past my house starting at my hydroponic garden because my tomatoes are already 3' tall.