Backdating Bachmann's Thomas the Tank Engine

I got a start on the running plate this week. I am thinking about thinning down the rear bufferbeam to further represent the Dalby-era Thomas. "Backdating Bachmann's Thomas the Tank Engine" may be a working title yet. The running plate needs some thinning down to 2mm itself, but I am thinking of putting a piece of plasticard in the middle (where the pencil lines are) to ensure that it's even.