Getting started on aspects of the project ....
My large Bagnall 2-8-2 loco will be hauling the full train of bogey coaches so I replaced the coupling on it's tender with an Accucraft one
Coupling Test
simple cut and remove solves that one ....
testing on the layout curves, the coupling fittings catch just enough on the corner of the underframe - another 1 mm of travel would help.
I will get some replacement nuts and bolts; the top of the bolt will sit nearly flush with the top of the coupling and fix the problem round the curves - thats the theory 😀