For The Arc I can't offer any info. But for Mando Armor I can help there, as My set is made from a trashcan. Use the wizard of Flight templates.Trace them out on the trash can of your choice. The Ones most people use are the Walmart specials for about seven bucks. 13 gallon sterilite. It has a curve to the front so this helps the curvature of the armor. Get a good Dremel tool (black and decker) use a cutting wheel and cut out the armor. Use a Heat gun to heat the plastic so that you can form it easily. Make sure to over bend it as it will unfold itself to it's original shape. I rivet everything to my vest but thats up to you. There are plenty of tutorials on here that will show more indept look on how to do it, but this gives you an idea. Hope that helps to get ya jump started.