First thing, I appreciate the advice and looking it over!
On the armor, I was told it was a Jim Tripon fiberglass kit. Looking at the inside its definitely fiberglass, so I am inclined to believe the seller.
1. For the visor, it would be nice to attempt level 2 one day so I may order the bubble lens anyways. I reached out to OPLE props about sizing on their bubble lenses so I can see if they would fit the helmet. They are cheap enough where i can grab a bubbled and non and figure out what works.
4. For the belt, I'll have to look into that, I was not sure where to get the materials, so that link helps a lot. I may trim up my current belt as its a hair too wide (3-1/2 vice 3-1/4), but since there are existing snaps, I may just start over so its 100%.
6. The seller was not 100% sure on the shoes, though they do say Dr. Marten on the bottom. I am tweaking them now as I don't like the laces. I am putting in a velcro strap that will be hidden by the ribbed flap. I know the look of the shoes isn't great, but that was mostly because I had trouble with the kids helping and fit issues on the thigh and shin. Once I clear up the thigh/shin fit issues, I think the shoes will look much better.
Right now my updates are all related to fit so its just some elastic and nylon strapping. Overall I got lucky in that the costume fits great, its just that the guy I got it from was a little taller than me so things sag a bit, especially around joints, which then makes it hard to move or do anything. I am working fit issues 1 piece at a time in suitup order so its easier to fix and test as I go.