Bernard (TPM) did some very nice sides for the K40 full brake that abused a Dapol B set as a donor. This build instead uses a generic 3D printed shell with etched trussing and the usual white metal detail. Given the underframe of the B set needs major work and the roof would need redoing anyway I think its an easier way to do the build (It doesn't really work for the BTK as that re-used the Dapol recessed door)

Sides are just tacked on for the moment as I'll need to take them back off for spraying.