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I like the idea of walk-on solar panels. Could you use something like a sheet(s) of plexiglass over them that could be replaced if scuffed by lawn chairs and suntan oil?
Here are the photos of the other roof deck taken by another member here (nf6x)...
I don't remember where I saw it (it was before I started collecting links related to the M109/M185), but I have seen photos of a deck built on the roof of a shop van, with a ladder and hatch. Some sort of observation platform. Throw an 8'x8' quick shade up there and you're all set.
Here's a rear deck for you. I think someone on here put me on to this guy's site, I was mostly interested in his interior layout.
Probably not a design suited for an M109, but cool anyway:
http://www.robgray.com/graynomad/wothahellizat/wot1/photos/large_photos/19131.jpg
And his Mk II...