That is a nice looking cab. You should not have too much trouble mounting it.
I have several Aero cabs that I plan on using the 123 chassis for. Seems to me there was no real differences in the frame except the length . But it has been several months since I looked at them . (pre move packing)
Other then improving the tilt hinge and relocating the rear cab mount.
I plan on using a piece of aluminum or brass tubing between the frame rails with pins for the tilt. Not prototypical but functional.