Excited by the prospect of having a working engine, even if it doesn’t look like anything that ran on the Canada Atlantic, I printed a copy of Percy’s original running board, and mated it up with some Accumate Coupler lids from my folder of standard 3D designs.
Bachmann had glued the cylinders on with CA, and one of them came off cleanly with CA debonder. The other refused to give up its bond before succumbing to the violence I inflicted on it with a flat screwdriver. It is usable, but doesn’t fit in the peg holes anymore.
The holes that hold the front of the running board to the cylinder saddle were not quite in the right position, and the screw holes inside the cab were .75 mm too far forward, but the rest of the slots and tabs worked better than I deserve.
The fun thing, however, is this: now I know where all the interface points are with Percy’s mechanism and frame. So, I can create a new superstructure that looks like a Canadian 0-4-0 ST. It might be worth spending a couple of nights in OnShape to do just that. Who knows what I might learn as a result?
Pembroke:87 
I have nothing productive to add but certainly more applause. I love following along on your adventures with Percy and so completely look forward to each new chapter.
It’s kind of neat to have this suite of CAD blocks (can I be forgiven the AutoCAD terminology here) that could be digitially combined to create models. To that end, though this learning was focussed on Percy’s 0-4-0 chassis could it be reasonably extended forward or aft with lead or trailing trucks for maybe 2-4-0, 4-4-0, 0-4-4 or like options?
Chris
Thanks Chris, I’m glad you’re enjoying the story.
The primary goal of modifying Percy was to get enough experience and comfort with steam locomotives to be able to go back and troubleshoot #622 and #10. However, I have another idea to pursue first. More to come on that soon…
Does Percy still have Buffers ????
Nope, and no vacuum pipe either.