I made a PC board this weekend using the photo-resist method. We had never done it before but it was drop dead simple. We got 15 mil traces with no problem at all. We didn't do any real experimentation nor did we have any special gear. We used a common laser printer with normal transparencies, a one-bulb florescent light fixture with a common indoor bulb, garden-variety photo-resist solvent (soldium hydroxide) and 3 year old Radio Shack ferric (ferrous?) chloride. And a sheet of glass. And some q-tips.
We were like monkeys doing math but we got a great result.
We built two stepper motor controllers.