Everything we got to build the Green House.... Hardware store: McClendons (Home Depot, Lowes, Ace all should carry what you need)
1" PVC 20 Ft sections xs 6, 3 tri connectors at the top. The bed we already had in place, but modifications were made on the inside to create 4 individual beds. 6mil plastic over the top. We came up from the back and got half way and then from the stopping point, over the rest of the frame. Large staple gun and lots of staples to attach it to some spare wood lathe we had to make the stablizers cross wise. We found a zipper that you can tape to the plastic for entry. ( Still need to get one more of these to finish the entry.)
As for heat, well we almost paid a hefty price when we had a cold snap shortly after planting. Right now I have an Aquarium light hung up and a small fan on the inside to help with circulation. I will be adding a different fan system, one that does intake and outtake. I am hoping that the weather will hold out through Oct., but if not I will be adding a thermostat controlled heater so we can maintain atleast 70 the rest of the way til harvest. I am looking for mid October for that.
We did bracket it down to the existing bed so when the weather gets real windy, the whole thing just doesnt take off on me. My son in law actually put this one together for me, he did such an awesome job on it.
Good luck.