These are now available, bagged up but WITHOUT THEIR BOXES.
Instructions are below.
Building is fast and straight-forward.
Bronco was the first manufacturer to introduce this construction method for separate track links. Two track pins are moulded together with the end and mid-connectors on. You have to add the individual track links by clicking their upper track pads to the underside of the link, which has the guiding horn attached. The detail is very fine and, as a real bonus, the guide teeth are hollow and look great.
For further comments on these tracks, take a look here.