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It looks like it, well done, she runs beautifully!
It may not be possible, or indeed desirable to you, but I wonder whether curving the rear of the frame up and over the pony truck and continuing it as far as the rear buffer beam might balance the back of the loco visually? I think it would mirror prototype practice too. Just a thought - it'll look lovely just as it is!
PS Isn't "Skylark" a lovely name for a class of locomotive??
I'd like to try lowering the body somehow but that would require major surgery on the motor block so I might have to live with it as is.
The fundamental problem is that the driving wheels are too large. It's not possible to replace them - there wouldn't be enough clearance under the motor block (and the Bachmann wheels are moulded on to axle stubs) but I think I can lower the running board by hacking a few lumps off it. However. This would leave insufficient room above the cylinders for the Walschaerts valve gear which was used on the actual locos.
The drawing of the proposed MWB loco on which this is partly based shows Joys valve gear which is a bit simpler so I might try squeezing some sort of representation of that in instead.
I can use a fair bit of modellers' licence as, to my knowledge, Kerr Stuart never produced a three foot gauge loco derived from the Skylark design - that's my story and I'm sticking to it .....
Decided I didn't like the "sit-up and beg" look of the loco and so took razor-saw in hand and attacked the motor block and the body. I've dropped the body by 7mm. It needed to be 8.5mm to match the drawings but that's as far as I can safely go. I think it now looks a lot better.
PS - Now noticed the boiler seems to be slanted up towards the front. Looks like another tweak needed.