Good pictures, Andy!
A couple of comments: Your cautions regarding using 120v receptacles for a low voltage application are spot on, especially since you also have 120v on your modules. Color coding everything was a very wise move.
Second, regarding the leg installation, the fixed cross member needs to be perfectly square to the module and straight as possible in all dimensions. Deviations from this result in legs that don't fit, or go in crooked. Properly executed, it's a great system!
Chris
LVHR