I custom made this 3 3/4" figure about 3 years ago. I still have it along with other Ralph McQuarrie Concept figures I did...I always liked this picture.
It was at one time. I had one- regular big poster size with a black border around it. But I just looked around online as well and came up with nothing.
Regarding the question of why Deak (Luke)is wearing a scuba tank I think RMQ's rationel was that the hull had a breach in it for boarding so there was no atmosphere. Originally GL just had Vader with a samurai helmet and veil. RMQ was the one gave Vader the mask and life support and thus in the painting Deak.
When I get the kit I'm going to display it with my Original SW portfolio print of that scene signed by RMQ.
The two "knobs" at each end of the grip are 1-1/2" in diameter, FYI. The candleholder mentioned isn't available any more, I think. The Bell grip has had about a 3/4" section cut off one end. I think of the grip as being a pressure switch, so no activation switch is visible. The knurled knob on the bottom of the pommel is my own interpretation, mostly because I needed something to hold the cup on, but it looked good anyway. Almost went with a lanyard loop meant to attach to the tripod socket of a camera, that way it would have been like the Graflex's D-ring. Still might try it and see how it looks one of these days.