Hey, very cool project!
These chairs are now available in "tactical" colors, but when we crossed the LD during OIF, all of ours were in "holiday" colors! Every guy in my team had his own folding chair, and everyone of them was a different color and a slightly different design.

In this pic, you can see the folded sea-foam blue and yellow chair in the fore ground sitting on the corner of the 3/4 ton trailer.
Another bit of trivia: That trailer was delivered new to our unit just before we deployed, and so to camouflage it we painted it with rattle-can spray paint from the local Walmart! I wonder what the Tamiya paint match is for that?!
(It was also equiped with farm-type pick-up truck bed fuel tank - the kind used to re-fuel farm tractors - to extend the range of our team. We purchased that from a local farm supply store in bright polished aluminum, the only color available, and after hand sanding it, also painted it with the same rattle-can paints.)
So, depending on the time period you're modeling, you can use these chairs to add a splash of color to a model or scene. Inscriptions and names written in marker on the chair backs were also very common.
Thanks for sharing your build technique!
BTW: Don't forget the cup holders on the arm rests!