Alrighty! My low hoop tunnel project got off the ground this weekend thanks to a little help from Grunt & Grungy's visual tutorial. The materials were all easily obtained at the local Home Despot and the total cost for two tunnels for 4' x 8' beds was approximately $25 each with enough left over to do another half a tunnel. Mine are not quite as heavy-duty as Grunt & Grungy's, but I don't have quite the extreme weather here on the west side of the Cascades. Fortunately, the design is flexible enough that reinforcing the tunnels would be a simple proposition if necessary. If they work out well, I'll beef them up for winter time use at the end of the year. The completed tunnel is planted with a mix of various early season salad mix and some Windsor favas. I'll be checking for little green heads over the next week. Here are a couple of pictures:
If you want to use metal pipe for your hoops, check out the hoop house and row cover benders offered by Lost Creek Greenhouse Systems.