If you have the tools, build it yourself. If your a weekend warrior in the garage, it will be fairly easy. Just start with drawings. Figure out what size and shape will work with you the best. From there contact a supplier (Regal Plastics or Allied Plastics) and see how much the material will cost you. 1/4" thickness would be the minimum I would use. Most of the suppliers can even cut out the shapes for you, IF you have good drawings with measurements. Plus it won't cost you too much in the process. The solvent application is easy enough. Be prepared with a good work surface and lots of bar clamps.