Morning, Jon.
I am not sure how comprehensive the start to finish process was for the casting work you have looked into so far, but would the cost come down significantly enough if you were able to get a correctly spec’d 3D resin link fabricated that a foundry could use to fabricate their moulds from and once the links were made, you could do the required finish machining on them?
Granted you would likely be having to deal with 300+ individual links, and still deal with the needed pins to assemble the finished tracks you need.
Feel free to reach out and smack me on the back of the head, if this idea is out to lunch.
David
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