So, in regards to the rear signal / reverse lights, I may have just struck upon a solution.
I'm already building custom LED circuit boards for all the lighting fixtures, so I'm thinking I'm going to order a second pair of the clear front signal housings.
What I'll do is, instead of using the red housings for the signals at the rear, use the clear housings and put the same light board in back as up front. To handle the running light / signal setup, I'm doing a board with a ring of amber LED's around a cluster of white LED's. In back, the ambers will again be used turn indicators, but the whites will only come on as reverse lights.
What do you think of that idea?
