Past few weeks I cast forearm parts in halves - just need another batch of the other half before I can get started on casting the upper arm.
I cut off the sprues and started filing the older parts, and also drilled some holes in the oldest part in the right. The quality is decent, but not perfect: it's hard to achieve a completely perfect surface with larger parts. I will likely end up filling imperfections with a metal filler which will create some gray spots and then just chrome all of them. That way they will be metal and chromed, so they will fit with the drum set better.