We are building a greenhouse for ourselves and our neighbor.  We purchases a bender to make the hoops and instructions from  http://www.hoopbenders.net/  The instructions were very good and enabled me to notice they had sent me a bender for a 20' hoop instead of the 10' so I am waiting for them to ship me the dy-10.  The greenhouse is going to be 10 X 20 and we are going to heat it with a little wood stove.

We have the foundation layed out and getting ready to level everything and drive down the hoop holders. Notice the spool of string in the upper right... I have found string to be your best friend when trying to level and square foundations.

Mounted the the Jig on the top rail of a trailer so that leverage could be applied to the pipe.

Bending the pipe into a hoop

The hoops

Installed end walls and door...  used 80lbs of concrete on anchor each of the vertical end wall studs.