Now I was quite taken with the whole “box pleating” idea so looked out some more designs that use this technique. This is a front-end loader, or bulldozer and was fairly fiddly to be honestIt does have an integrated scoop, hints of a caterpillar track and a nicely formed cab, but I think the folding pattern is incorrect at two key junctures, so I improvised.

have a go and see what you think: http://origami.happymagpie.com/diagrams/bulldozer.pdf