Thought I'd get a thread up and started around my intended build. Most of the work will likely be next year but there are a few bits that I can start looking at in advance.
My initial plan on scaling is as follows (aiming for 7'3"), blue indicates my height + 30cm stilts. I'm intending on adding a mesh / vent in the breathing mask to see through.

I'm going to aim to complete the suit and chest box/harness to clear as a generic Gigoran, then start on belt, backpack and weapons to upgrade to Moroff.
Plan as follows:
Stilts - build and practice walking on. To get the correct height I'm looking at building these from scratch, smaller height drywall stilts seem to be too expensive.
Feet and Hands - frame / shape and foam padding for feet and hands
Body shell - looking at behind the scenes shots there seems to be a hard plastic shell for the waist, chest and shoulders. I'm going to look into making a mold and getting it pulled from ABS, and will then add holes across the structure for ventilation.
Foam - to take off the hard plastic feel I will use a thin layer of EVA foam on the body shell. This should then give me a template for...
Mesh suit - standard pyjama pattern for legs, aiming for a slightly more fitted torso.
Latch hooking - sweat, tears and frustration
Chest harness, box and breathing mask
Yes this is going to be a long build, and no I've not done anything of this scale before. Should be fun :) If there is anything I'm doing that could be improved on, adjusted or added to please feel free to comment!