Paul,
No it hasn't been modded, i have just taken off the tripod legs and mounted it on a pier, it just stays there aligned all the time, covered of coarse.
The plate you see is the top and bottom plates that are usually put on a pier to get the whole thing level.
The Mount Hub stays on the plates, and the mount is moved indoors when not in use.
It is a small job to put the legs back on the Hub.
Cheers Leon