Quick update from yesterday's progress:
Bogies have met the razor saw and the front section that carries the coupling have been removed. A strip of plastikard replicating the rib at the other end for strength.
Pickups next and a 10mm hole for access to the new roof fixings in the undriven one.
I've also cemented in small sections to the body sides where the switches used to be and cleaned, lubed and test run the original power bogie - noisy by modern standards but at the speeds it will be running on Fourgig it should be fine.
Hope to get the body ready for a first coat of primer over the weekend