Stan, Gunrunner/ All,
Thanks for the info on the diodes. I already ordered some from Evan Designs that are pre- made up. I have used these before and yes.....they cost more, but they have been running ok for years on my layout. I will keep the other website info on hand for the next project.
Meanwhile, I have started making my 6 block signals. I have a load of balsa wood and it was real easy to get something reasonable looking. I have them primed now and will paint them silver with black where the diodes will be.
Stan, I am now going to extend the Black wire coming out of AIU to a centrally located terminal block on the ceiling layout. I will then run 6 separate wires from the switches to this terminal block.
Frank