I finally got around to figuring out the electronic controls setup for R2. After nosing around the sparse documentation online, I finally bit the bullet and asked for help in the forum.
Fortunately for me, David L., who recommended this configuration, was very helpful with the controller settings. And once I emailed him pics of the configuration, he was able to tell me that I had some wires connected improperly to the receiver. After that, viola! Actual working RC controlled Jaycar motors. It was a thing of beauty! Thanks David!
Now I need to get those puppies installed into the feet and get this build moving, literally and figuratively!