Hi Justin,
what are the two vents for? wouldn't that allow moisture and dew in?
While I like the bin with the cork plate idea, that requires the counterweights, dovetails etc to be removed. I guess objective here is to leave everything with the OTA outside??
might sound silly, but how about one of those tall cubicle tents with pegs or weights at the base to prevent it flying off?
http://www.raysoutdoors.com.au/onlin...spx?id=1021192
you'd have to remove the base so you place and remove it vertically.