I might consider re-doing my armor in foam as seen below. The one on the left is the foam elbow in progress while the elbow on the right is the finished one in resin/auto filler.
Creating parts out of foam is a lot faster to make than I expected (took only a day to make two elbows ready for painting as opposed to having to wait for resin/auto filler to dry for one). However, it seems I have to decide between lightweight+construction speed or durability for my armor. Do I go with foam or auto filler?