Mike,
I got a push-pull conversion kit (LMS) from Comet, ages ago, and converted a Bachmann Suburban non-corridor but I am not happy with it and will redo it. The other is a Non-corridor Brake Third D1735 that I started, to couple with the push-pull. The roof is just sitting on as I have heaps to do before fitting it. After seeing your efforts and Coachman's, I admit to not being in the same class.
Peter