ScottV I worked with Terry and did my entire PRR layout with Terry. Its been many years since I did it, but Terry is the best. I used both blocks and switch position for every signal. I was lucky and have NJ switch machines giving me multiple contacts but you should only need one per signal. My layout was featured in Oct 2009 Classic Toy Trays with a segment on Custom Signals.
The process can get intimidating but just keep going. Terry would help me out as I went. I would recommend Terry if your concerned about building the back board and the tumble down boards. It would speed things up. I just don't know if Terry is still active I haven't spoke to him in a couple years.
