More progress. Installed cross pieces for the interior of the modules. Two cross pieces cut, glued, and air-nailed into place. I also added two flat cross pieces at the bottom which will allow for the modules to be attached to the shelving.
I also began installing the Bullfrog and Sidewinders for controlling the turnouts. These are available at Fast Tracks and well worth the money.
I had to use a Sidewinder, which allows for the Bullfrog to be mounted sideways for low profile mounting.