Through some testing inbetween Substance and Maya, I figured out how to sew together the most efficient UV unwraps for all the construction pieces in my modular building kit, as well as for my props. In addition, I made sure to color-code each part of my objects, so that I can take advantage of ID paints in Substance, for an easier workflow.

I took screenshots of just 6 of my objects for the sake of the WordPress post, but all parts of my modular kit have been UV unwrapped.