This looks good to me. In my opinion, unless you're going to control your whole empire with a computer, etc., R/C direct to the loco is the way to go, and RailPro even has a dongle that allows a PC to control the loco! Given today's technology there's no reason to have a "command base," etc. Metal loco bodies are a sticking point. That might be the only reason I can think of to propagate the signal up through the rails.
I've been thinking about direct R/C for a while (I looked at Airwire though, not RailPro.) Airwire's decoders are designed for battery powered operation. I'm not ready to make the leap to battery power, so I would be installing a rectifier / voltage regulator circuit between the track pickups and the decoder. I've been sternly warned that they are very picky about variations in input voltage, so anyone considering this approach needs to allow room for a helper circuit like this in their loco or tender.
I wonder how difficult it would be to make resin castings of every coal tender body in my fleet to address the issue of signal reception? I never liked die-cast tenders. Now I really don't like them! Following this thread.