I've got plenty of material to mock one or two more up right now, so I'll make an 8'x10' next and play with it, and I guess I can just keep whittling it down until I find how small I can go.

Today I found an adhesive nylon "Patch" in the sewing dept at Wal-Mart called "Bondex Outdoor Restore". It shows tents, backpacks, and jackets on the packaging. It looks like it's pretty tough stuff. It might work good to reinforce the plastic sheet I'm using where the ridge-line meets the edges, the corner points, and other potential tie out points.

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"You want to go where?"