alright so i made a list of sone things that looked reused, modified, and new
reused:
FOTK- forearms, shoulder bells(modified)
shoretrooper-ab plate, hand guards( and maybe gloves too), biceps ( might be modified)
imperial combat assault tank driver- belt and thermal detonator are the closest to the mountain trooper but are modified a bit.
FO snow trooper- shin guards, boot spats, boots
new: chest and back plates are new but do use some stuff from the shoretrooper chest and back plate, the hip plates are a bit more different from the shoretroopers, the helmet is very close to the shoretrooper but is obviously heavily modified.
anyways this is what i see is used to make this armor, atleast after observing the the photos and crls let me know what you think