I know that sporting stores sell many different types, I've seen some as big as 4 men. They are colapsable(sp) and easy to get around. I was going to build one myself for next year, my sons as been bugging to go icehole fishing. If I decide to go I'll probably go with one of these types they seem pretty easy to use. The problem with building your own is weight and finding the right materials. I would quess pvc pipping and tarps would work.