I'm starting to assemble the rear suspension and have discovered the Cortina axel has an offset prop. I presume I just make the tranny tunnel to fit, loosing a bit of the drivers side area? Or was it just an optical illusion??

I found the same with the capri axle. The diff is central but the nose is offset to the driver side. I made the tunnel slightly offset to that side for about the last 150mm and the prop clears by 15mmish. I used fibreglass seats from MK and they fit in so I didn't lose much space. ___/ A bit like that but not as exaggerated.
Pete.