Rolf,
Last time I bought a 49er track from Ronstan it cost $84.

I think the billet this would be machined out of plus the time the machine is tied up would make it difficult to compete.
I have a friend who has almost finished a CNC machine.
Will cut material just a bit smaller than 2500 x1500mm.
Building it in his garage and doing a really professional job of it. I could ask him how long he would expect his machine to cut it when I see him next.

Regards,
Phill

I know that the voices in my head aint real,
but they have some pretty good ideas.
There is no such thing as a quick fix and I've never had free lunch!