I'm 5'11" what would be the best way to scale the Files to my size correctly?
A lot depends on your build as well. I would start with a chest scale of 470, and then use the
point-to-point measurement tool in Pepakura on other pieces as you go to check scales relative to your own measurements. All of the pieces (except for the helmet) can be imported into Pepakura together to take longer body measurements for comparison. Here's a quick scaling breakdown that can help:
Chest is usually just scaled proportional to overall height, because it comes out roomy. If unsure, you can measure from armpit-to-armpit and adjust your scale accordingly on the chest's arm openings.
Lower torso can be scaled the same or even slightly larger than the chest; I left room for the two to fit together. Using point-to-point, compare the narrowest section of the waist with your own and make sure your scale is at least large enough to fit you. It may still be necessary to make a velcro seam/etc. to get in and out, although Robocop isn't exactly svelte in the waist area lol.
Biceps and forearms should be scaled the same to make sure the hinging matches up well. I measure from the center of my arm where it reaches my shoulder down to my wrist, and set my scale accordingly using point to point. Once the bicep is built, the arm opening 90% of the time is cut larger for mobility, so this also gives you more wiggle/fit room to help your arms function well.
Gloves I never intended to make pep gloves, I'd rather use neoprene or do custom casts. I left the forearm in two pieces specifically so you can ditch the lower forearm if you want and instead using a long gauntlet glove (like black neoprene hazardous chemical gloves)
Thighs and shins should also be scaled together like the arms for hinging. Point to point from the Thigh section top to the shin bottom is pretty comparable to the distance from your hip to ankle-bone (I'm obviously not big on proper anatomy). The lower calves on the model are VERY narrow even when scaled properly, just a heads up that depending on your build they may have to be widened.
Boots if you can fit your shoes inside the boots at the same scale as your leg pieces, awesome. If not, they can be enlarged a bit. The only point of connection they have to the legs is through the leg-pistons, otherwise the shins just reach down on them like an ironman suit would.