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I can't answer your questions about Bruce Chubb because I spent twenty years in electronics in the Air Force and I could never understand from one day to the next what he was talking - maybe my confusion came because basically his system was designed for novices; that's fine but tain't for me - whenever I read a Bruce Chubb electronics article my most frequent question was "Why is he doing it that way?". Anyway, your power requirement for a signalling system is going to be based, in large part, upon how many lights your going to be trying to light at any one time. If you have a lot of lights and you running a continuous lighting system you are going to need many power supplies - on the other hand if you use approach lighting your not going to need nearly as many. I do know one thing, you would be better off with a dedicated power supply for your switch points. As for signals, start with one; if that breaks down go to two, etc, etc, and soforth. That doesn't answer your question but it's the best I can do.
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