I've used this guy to build a variety of custom gun stands for me over the years:
Fort Sandflat
If you search around his web site, he even makes a stand for displaying a Luger w/holster.
He is an outstanding carpenter & wood worker. He is a regular at many of the North Texas and Oklahoma gunshows.
If you send him an idea for a display rack, he will draw up plans and make it. His prices are reasonable too.