Yes, the forearm is scratch built, but I would more call it scrap built... built from various materials I had laying around, and a re-purposed buckle from a snow board binding I broke in the half pipe...
Forearm is actually symmetrical accept for one armor plate" which I have one for the left and one for the right arm. Designed so that 2 cast pieces could be made from one part, then add the non-symmetrical pieces (one plate and buckle), thereby making a right and left forearm. I added a thick pad to hold it in place, but it's actually a bit thinner "wall thickness" to accommodate a sleeve under the piece. Overall, not bad for 3 hours. Just noticed there are no views for the funny vented thingy on the top of the arm... I'll have to fix that tonight.