While cruising the web for info on SPAAG systems, I've found some interesting bits & pieces that I'd like to post up here.
A conversation from worldaffairsboard.com that discusses some US SPAAGs (other contenders for the DIVAD project)
link here
Scroll down about half the page, I think some people will be happy to see that the rotary cannon, i.e. Gatling Gun was well represented. I tend to disagree with many of the posters there about their definition of a white elephant though.
Phalanx systems on HEMTT platform (although I think we've seen this somewhere before, Antenna I think it was had some artwork of a HEMTT mounting two Phalanx systems.
Link here.
Finally, I think if you want some artwork (mostly top-down stuff) for a gun system, the people at RPGMapShare might be able to help. They do a lot of artwork for gaming and have a modern section
here.
Considering that some of their modern military vehicles are done as hull and turret seperate, you might be able to mix & match for some hybrid vehicles (although I have no idea what scale these guys work at but with 61 pages of 1940s to 2000s vehicles, this site could be a big help for making your own maps for the next RPG session.).
Although I love the work that the guys at gunpoint-3D.com do and would love to see them work their magic on a Gatling armed M1 SPAAG, I think they only do commission work and they'd be a bit beyond my price range. Their example of the M1 AGDS is
here.