I really thought I could get the sum below 1000, but reducing by the last 33.3 was harder than I expected. I didn't manage to remove any more Arms, Tracks or Instructions.

The Arms I am really unhappy with in this solve are Arms 7 and 8, which are just so expensive for what they do.

That being said, there are some really cool Arms, namely numbers 2 and 12, which manage to do a lot of things at once. Arm 9 also manages to handle the Quicksilver quite efficiently. I don't think the rate can be improved without increasing the Cost by quite a lot.

In the end, I do believe, with tighter geometry and merging a couple of Arms sub 1000 is possible. I predict 1st place will be around 980. ^^