Star Wars: A New Hope LIN-V8K Mine-Laying Droid from the Sandcrawler Scene

This is LIN-V8K, the black dome mining droid from the sandcrawler droid sale scene in the original Star Wars movie. I have been generally not making droids that have action figures, but this guy has bothered me ever since the very nice figure was released. First of all, in most renditions of the droid, there is an arm sticking out of the dome, but the prop gives no evidence of the arm nor place for the arm to protrude. Second, the figure is tiny compared to the prop that was large enough for