Where do you live? If you live where they get two metres of snow each year you might want a different frame than if you never get snow and want to keep the rain off.
I just built a frame for our Irwin Citation 34 - but we live where we can get a lot of snow. I used inch and a half PVC pipe. There are lots of good ways to built a frame. At our club some use PVC, some 2 x 4s, some metal conduit.
If you need pictures, send me a private message.
Irwin Citation 34