Just saw your post, @TheSweatshop want to see your work!!! ive bought some 3d files, and also think the chest and back from PPC are the best, i'm currently making an Tie Pilot R1 that's why im using those parts, maybe in the future ill make an TK.
Ive bought the rubber straps from Moncal, ive printed them both in 100%, brushed with acetone/bondo, printed in two parts the back and the chest in 3 parts(on an ender 5plus) putted together with 2 part Epoxy sanded and this past weekend with resin, and reinforced in the inner side with an little of fiberglass.
here's some pics of the wip https://drive.google.com/drive/folders/1WNYYhgJXncQUGYi4ZrnOxmM0iwDcaEl3?usp=drive_link
i think i have to make bigger the O II parts just an little bit what do you think?