This is a Republic Commando-style Crab Droid. It has the extra detail that never appeared in the movies. In this diorama, it is seen with two space battle droids fighting 747th elite orbital drop troopers I made with sandpaper and Sharpie(r).(I spent three hours on each guy to get the Sharpie(r) marks at the perfect place, so they don't look very sloppy at all.) I'll show you the guy in airborne armor later:-). Thanks!