Introduction, Belgian Ulster rep

[Austin in the Shed]

Rather than cutting the body ,think about making a longer bonnet to suit the longer chassis. you could cut the body back slightly behind the drivers seat to get a bit more leg room without spoiling the body proportions.You would still have to move the steering box back / extend the column and reposition the pedals
There is a photo of a car built pre war like this in the front of Chris's book.