I was leafing through a Robert Harbin book “Introduction to Origami 4” and stumbled across a lovely little box-pleating exercise:

This tank, designed by Laurie Bisman is neat, it is 3d, has a turret, caterpillar tracks and a mobile gun – I wedged a paper shim under it to keep it upright for the photo.

I am actually amazed it worked given the 3×1 rectangle I started with was not entirely straight when I cut it. there are many junctures in the model where there are no measurements and, given pre-folding experience I would have done differently – I un-folded and re-folded the turret 4 times before I was happy with it’s dimensions for instance. Happy with the result in the end – first-fold can be like that.