Thanks Bill! I think it's between 1.75 and 2.25 pounds. Since I posted this, I just about figured everything out, either by googling or by trial and error. There's more information about it in my gear log thread.

Nylon webbing sounds like a great option. If the cord loops don't hold, I'll probably go that route. If I had thought of it before I attached the tape, I might have put hard plastic loops there. I've got an empty chapstick container begging to be cut into cross sections for that purpose.

I look forward to seeing what you've made. I've got the bug make more tarps/tents. I want to try that polyolefin (window film) at some point, but I may just mock up something with a couple of the 10x10 super thing plastic drop cloths I just bought next.
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The journey is more important than the destination.