My attention turned to the pre-heater today, so the chassis was stripped down to release the Hornby underboiler/motion support and the resin parts trimmed up and superglued on. After a quick test assembly to make sure everything was in the right place the joins were re-inforced on the insides with epoxy resin glue.
After leaving the epoxy to set, a final fettle was needed to ensure a good fit with the chassis block and job done (apart from painting).
Note also from the photo the section of black plastic that needed to be removed to clear the side chimney assembly.
I've also fitted the handrails. I had a couple of Hornby ones left over from a previous project, so these were pressed into service. Still need that guitar string .....