EB member HJR has recently uploaded several photos of his AT-IC (All Terrain Ion Cannon) on flickr, and they’re well worth a look. According to Wookieepedia, the AT-IC was one of the prototype vehicles designed for Kenner’s 1986 ‘The Epic Continues’ toy line, which failed to reach production. In theory, it was an Imperial design but I think it would have been better if it had been used by the rebels, due to the ‘improvised’ look.
I recall seeing this MOC a while ago, which is very faithful to the original reference material, but the new images show it in greater detail. The cannon and head are both particularly well done.