I have a freind who is a physics professor and is working on making a bench top fusion reactor. I don't know all the details but it uses dueterium for the fuel and is contained in a stainless steel pressure vessel that most CNC equiped machine shops can make. It is basically used to demonstrate how fusion takes place. If you do some google searches about fusion reactors you will eventually find several sites dedicated to making such experimental devices.

Last year I helped him put together a cloud chamber that could be hooked up to a video camera or 35mm for time exposures. Pretty neat.