I'll take one of those meshwalls in a light grey frame to highlight the structure (thin tubes along the edges, leave the faces exposed)
I like the refraction rainbow, too. Make a mini of that to see whether the color shows through
For the heavy/medium armor, I think the layered method is better, the variable thickness is a bit too subtle, though if you made the light stuff paper thin, and the heavy stuff 50% thicker, they should be obvious as to which is which. Some light on underside of the armor might do the trick too.
Ah, the plasma armor. By the blue ring, I meant a hex outline to replace the center tile of grey plate over top of the plasma.
Check out
My cheap drawing to see what I mean