I believe in the back of either a bostick and Sullivan book or in Dan Burkholder's book there's an excellent diagram for building one. I replicated it in Mexico City very inexpensively since my buddy and I new a good carpenter who did it for cheap. We found the bulbs which were GE something or other easy to find and cheaper than the book stated.
I'll see if I can find what book I'm thinking of.
It's in the book "The New Platinum Print" by Sullivan & Weese. I think it's out of print.