How my tracks are done :
The track links are made from laser cut parts. The frames help to position each half (inner/outter) accurately for welding (TIG).
Track pads are milled by pairs.
the track pads are then bent, separated and receive final cuts.
Sorry for this one....not so clear. The links are assembled with a small bushing. This is the reason why the hole of the inner half is larger than the pin hole.
Then the links are soldered to the pads.