> some sort of fastening system (top and bottom), which would be a lot easier
> and almost as raintight.
>
> Has anyone ever seen this done? (And no, I don't mean 5 mil poly around your
> rusty mobile home trailer held in place with hay bales.)
>
>

It's a nautical area--
talk to an awning &/or Boat canvas guy/girl-
Fasteners would be swivel snaps..
Could probably even get it made of Kevlar..

DD