I made this Ultra Violet bed to make printed circuit boards a few years ago without Instructables.com in mind, so rather than a step by step pictorial description of how I made it, I'll provide you with a few pictures of the finished work and hints on how you can do the same. Hope this will help anyways.
First of all, safety. Notice that this is a mains powered device so maximum care must be taken in the design to insure that for no reason someone may come into contact with live parts. If you are not sure about medium voltage (mains) electrical wiring practice ask a friend or someone else whom is.