I made mine 5'x6'. With three pieces of 10' 1 1/2" PVC. Four 90° elbows. Two 4-way T's.

One piece of PVC cut in half. The other two cut 6' long. The 4' sections are cut in half to act as feet for the frame.

I used a 10'x12' heavy duty tarp (brown & silver) and bungee cords for the for the covering.

I have 4 of them built. Light enoguh to drag two around at the same time. Strong enough that they can get blown around the yard without damage!