So I assembled the box. The instructions suggest gluing nine lengths of .3mm wire between the hinges to mimic the mechanism on the real truck.

That's way too fiddly for me.

How about use one length of carbon fiber antenna passed through bits of wire sheathing cut and placed in the right spots?

Easy enough to remove the existing hinges. And glue the new ones with the rod in place.

Here is the mockup, haven't removed the plastic hinges yet.

[ATTACH=full]142890[/ATTACH]

I did look at brass tubing, but cutting 12 tiny lengths would have been a royal pain and a bit big.

And also some larger sheathing with brass rods, but they looked too big.

So I think I have a plan.