I'm thinking of using some PVC pipe and fittings that are drilled for a pin to hold them in place,then using a tarp as a cover-securing it with larger diameter PVC pipe lengths with a quarter sawn out so as to fit over the pipe and locking the tarp in.That method works well with my tarp garage I use as a hunting camp.whatever I build has to be cheap,easy to erect and light weight-and be taken up and down easily for transport in a canoe