I have the bottom of the facemask tucked under the opening of the chest armor mainly to simply hold it up. And the generous neck flare helps in doing that, and tucking it in hides that flare. But I don't think that's movie-accurate and it would limit freedom of motion. To tuck or not to tuck for display purposes?
I'm guessing it's a major faux pas to tuck it under and the facemask should float above, or be flush against it. Can someone confirm that for me? If the helmet floats too high above the armor you get that Vader-helmet-on-a-stick look which isn't very flattering.
Still just tinkering with this at this point, but here's a few more pictures of this armor with the DPDLX, tucked.