Mine is low tech. A box about 18" square by about 9" high, with an open bottom. One side has lower half hinged to lift and slide contact frames in.
Wood is white coated melamime particle board
Screwed to the underside of the lid is a set of 9 screw shell sockets in a regualr pattern, and then fitted out with 13w BLB compact flourescents.
With the Dr. Ware new cyanotype mix expsure times are about 30-45 minutes.