There is a bit of information around on a couple of Chinese language forums. I only have gobbledyGoogle translations to go on, so I don't know how accurate it is.
It seems that this was a project started in the late 1920s in Liaoning Province in north-east China to design a truck which could be produced from locally-sourced materials. I don't think this was fully achieved, and some parts and materials had to be brought in from elsewhere. It was based at a mortar factory, and seems to have been properly funded. The chief engineer of the project was an American, as mentioned earlier. His name was Daniel F. Myers, but I haven't been able to find much about him.
Named Minsheng (民生), "The People's Livelihood", there seem to have been three models designed, designated 50, 75 and 100. The only one I can definitely identify is the type 75, which is the smaller of the photos below. I suspect the puzzle truck is the 3-ton 85-horsepower type 100, but I can't prove that. There are some technical details, but it's not always clear which model is being referred to. The larger photo below shows the puzzle truck, I think. At least these two prototypes were built, with a slogan across the front bumper which says "Powerful enough for the worst roads. Fast enough for the best".
There were supply and manufacturing problems, but a preliminary batch of 15 chassis were laid down, though they were never completed. They were destroyed, and the whole project came to an abrupt end when the Japanese invaded north-east China in September 1931, following the "Mukden Incident".
