Whoa!!! You are making this so much more difficult then it needs to be. If you are contact printing all you need is a voltage regulator (a good suggestion when enlarging as well), a simple light source (ie. a light bulb), a frame, and some sort of timer, Ansel Adams recommended a metronome. This is a rudimentary setup and it is capable of producing the highest quality prints you will EVER see, look at the works Edward and Brett Weston. When printing this way you will need graded paper, which is no big deal.

always remember the words of Albert Einstein "everything should be made as simple as possible, without being made more simply." Words to live by.