When I built Revell AG
's 1/400 Queen Mary 2 model I wanted to put it in a plexiglass display case. Due to its size (nearly 3 feet long) I had to have one custom made. After searching on the Internet, I found a company called Innovative Plastics located in Huntington Beach, California. Their website is www.plasticfab.com
. Though they have lots of stuff premade, they can custom make a case for you. you just have to email them the dimensions you need and shipping address and they will reply with a quote. As a benchmark, my Queen Mary 2 case has dimensions of 36" long x 8" wide x 10" high and cost me a total of $200 plus shipping. It is made of 1/4" clear acrylic that sits on a 1/2" black acrylic base that was included. I am very satisfied with their workmanship and no hassle service in having the case custom made. You might want to drop them a line as an option for you.