Although the Gatlings in the movie are disassembled, I didn't want to go to that much trouble, so you just pick them out of the boxes and set them on the ground. They will be manned by two Highlanders each with their rifles cut away, and, of course, an officer. They are in process! Here's a picture of how they will be uniformed.
The assembled Gatlings can be removed and baggage substituted, or can provide an improvised howdah that can hold two figures (a little shakily).
Once again, thanks for looking, and comments are welcome!