I am an ex-All Wheel Drive and Clark Equipment Apprentice. The Michigan 175DS models for the military were built before I joined in 1963, but I am familiar with them. DS stands for dual steer. Meaning they had fore and aft driving seats for a common steering wheel.
If you are interested in making a scale model, you may use my 1954-61 Michigan 175A standard series 1 model in the Sketchup 3D warehouse. It's 1:1 scale done from an overall 175A series 1 brochure dimensions and memory. Plenty accurate enough for scale models. Check it out. In Sketchup it can be easily converted to othe scales.
https://3dwarehouse.sketchup.com/model/579886383923e3d998b8c800ae001b66/Michigan-175-Tractor-Shovel
Incidentally, towards the end of my apprenticeship in 1967, I, and another apprentice produced the drawings for Meccano Dinky Toys, that resulted in their model of the Michigan 180 series 3 dozer which was released in 1968. Models were offered to the staff at friendly prices, and I still have mine today.
Regarding the Military Michigan 275's of the early 70's. I was a lot more intimately involved with them, both in the engineering and being personally responsible for the performance and acceptance testing with the men from the ministry. See pics below, taken on the Clark test site at Blackbushe airfield. 275's with slave tyres and slave weighted buckets. I had hundreds of happy hours there during my time at Clark, playing with just about every model that they produced.
There were several other interesting military projects at AWD/Clark. The aircraft carrier tow tractors used from the mid 60's and up until the final Harrier days. Also 15T wading crane, chassis by AWD, crane superstructure by Smiths of Rodley. I built the last one in the early 70's, many years after the first production batch, As with the 275's we built about a dozen of each. Below is a nice pic of the last one in the wading tank at the MVEE Chobham in 1973. We used the MVEE facilities at Chobham and Hurn quite a lot for testing.