Really nice work, and I like your photographs as well.
Which model # AT-AT is yours? I recall there were two MR AT-ATs - I think the first one had straight legs and then the second one (yours) had the "in-mid-step" kind of action posed legs. I think one might be SW-123 and the other is SW-136, but I'm not sure which. SW-136P is the one with the signature from Phil Tippett.
Thanks and good job!