So, I usually post in the blog thread when I make stuff, but now I'm gonna post it here and then just link to it.
I'm also going to just copy the post verbatim that I made on an armor forum, if there's any words that you want clarified just ask:
As this is the last day I could get in the shop before my buddy leaves for Pennsic, I busted my butt to finish the first half of my new arm harness. It ain't terribly pretty (as far as symmetrical holes, straight lines, smooth curves are concerned), but it'll get the job done and it weighs less and protects better than its predecessor. It's also all work done by me (except for the shaping on one of the rerebraces, and a couple passes of polishing on the shoulder cops) from patterning to polishing.
The new pieces are the rerebraces and spaulders. After Pennsic I plan to make a very specific style of cased vambraces (apparently seen in German effigies, my buddy has a lot more history knowledge than me) that have a solid bottom with a splinted top and to finish or make a new pair of elbows. I like what I have now, and I have a pair that just needs polishing, straps and holes for pointing, but I'd like to make a set that has a deeper point. I also plan to put a little bit of brass edging on the shoulder cops, which is why the third set of internal holes aren't attached to anything.
Spaulders are an aluminum, not sure what kind though it is thick and sturdy. Rerebraces are t-6 aluminum. Elbows are mild steel (from Rough from the Hammer). Vambraces are splinted galvanized, the leather is dyed with period techniques. The vambraces were the first pieces of armor that I made, in march of 2012.
After being struck in the forearm close to the elbow while floating the vambraces to the elbows, I decided to rivet them in to keep from sliding down and exposing that small bit of arm as it hurt like hell.