I have now come to that wonderful stage where I was going to put in the rear Axel. But we ran into trouble. The cradle mountings did not fit. The distance between the holes measured cross over from one mounting to the other is about 1/2" wider than the distance between the holes in the chassis.
As can be seen here:

When I measure like this which the the distance between the closest holes in the cradle mouting I find the distance is 9"3/16:
Anyone With a clue what this is. The Cradel mountings are from SNG type C17198..