I like the way this greenhouse is constructed. With the way the polls are secured to the ground they don't need to be permanent, as long as they are not cemented in. And it's my understanding that as long as the polyethylene film is tight, it should be fairly durable (though I'm not totally sure), I have also found out that they make a polyethylene film tape to patch tears (just in case). I wont be needing the thermostat controls to raise and lower the side panels, I can do that manually. Even though I would use the metal pipe for securing it to the ground, I would probably use PVC for the ribs (bows) instead (but would look into the cost difference). The PVC just wouldn't have nice rounded look, but still be functional with angled corners.
Horticultural Engineering - Rutgers University
(click on "
2003-2007 High Tunnel Project" then at the bottom of the page that comes, up click on "
Pictures of High Tunnel Construction and Preparation")
P.S. Of coarse I would also have hydro systems inside, instead sowing the ground for soil plants.