@Medizin, good suggestions
I have blueprints for Finnish truck Jyry-Sisu (K44), which was introduced 1951. Image attached.
I need to finish my Volvo F12 (from 1977), which is not far actually, just need to make config files and it's ready.
I can make the Jyry-Sisu also, unless there's someone else who wants to have a try?
Edit
Some tech data from Wikipedia https://en.wikipedia.org/wiki/Sisu_K-44