So I just got back from the garage and made some progress in about 3 hours
Cowl panel fits well on the new cab
I started disasemble the front
it's hard to see on the picture, but the oilcooler is attached to the radiator using tie-rips...
front panel came off without a real hassle, only 2 bolts needed the "grinder approach"
comparing the cab corner of the old cab with the new one...
saterday I'm at it again, maybe I'll manage to get the old cab off.