You can weld plastic with a plastic welder. Get some plastic panels and weld them to whatever for you would like. (It's tough to figure out)
http://viewer.zmags.com/publication/...#/3f0390ad/592 There is an example of some sheet plastics and rod.
This is who I get some of my plastic material from
http://harringtonplastics.com/ look through there for some info.