I have one made with a wooden framework using safety glass on the sides and a beveled safety glass on top. Unless you are looking straight on at the case I think it takes away from the mount and the scenery a little. You should be able to find a custom cabinet shop that will tackle this one for you if you choose that route.
(http://i66.photobucket.com/albums/h248/gslam95/OsceolaSmall.jpg)
The other one I have is done with leaded glass edging which looks better in person than the picture but it makes for a very heavy display and difficult to move.
(http://i66.photobucket.com/albums/h248/gslam95/OCL-2640x480.jpg)
I am sure there are many others out there can jump in with some examples and good ideas as well. Hope you find what your looking for and good luck hunting this spring..