Dave;
Pg. 76 of October 2004 FSM has a company named FULL VIEW DISPLAYS with a web address www.fvdisplays.com that may work for you depending on the scale and length.
Check through the back issues for advertisers in FSM there was a company that always advertised there but the name of which escapes me right now and they made custom acrylic display cases all shapes and sizes.
Another option is do it yourself and I think FSM ran an article on how to make them. Check the FSM Magazine Index. Or check with a local trophy shop and see if they can refer you to someone.
I hope this helps some. If I find more concrete information I will post it on discovery.
Cheers;
Gregory