Quote Originally Posted by kb244 View Post
I want to experiment with the idea my co-worker came up with in terms of dodging contact prints by laying shapes down on the lower diffusion board.
That is no experiment, it is a proven technique for contact prints made on a contact printer.

There was at one time (newer than your machine) a super-deluxe volume production contact printer that had a whole bank of small lights, each one with its separate on-off switch, the idea being that you could adjust the exposure across the LF negative to give dodging and burning effects. Say you needed more exposure in the sky, you would leave those lights on full, and say, possibly switch off every other light on the rest of the negative area. Of course the whole light source of many small bulbs was diffused thru an opal glass, upon which you could also lay dodging papers, as this was below the glass plate you put the negative on. Quite a machine.