Thanks for the additional info and the pdf-link above. I found that also and seemed to be a valuable source for info.
I think I will need to get a "new" cabin for my truck, since the original has so much rust on it. So if you know suitable rust free cabs lying around somewhere with reasonable price, just let me know...
I can see that quite solid full trucks are being sold with 1000-2000usd, which would not be bad price for a "donor" truck, but ofc the shipping to FI will cost something like 3k$
This truck's 235 engine has been rebuilt years ago and not started since. During that rebuild there was some oil pressure problems fixed, so it should be better than new, just need to get it running first.