Buffers

The pictures of the full size locomotive seem to indicate that the flange at the end of the buffer body is much less pronounced than is shown on the plans.

There is also a sheet metal step with dimples on it which I believe can be obtained from Polly Model Engineering.

There are also four small bolts clearly visible in four places between the corner bolts. These are missing from the plans. I understand that there's a plate between the buffer body and the buffer beam and it's that which is compressing the spring with the four bolts.

The diameter of the buffer head is also significantly larger on the full size locomotive, and it's much thinner than the plans indicate. My guess is the LBSC just took a generic design for this without checking the real thing.

The pictures shows what it really looks like.

The buffer head diameter is 16" which at 1.0625" to the foot gives a scale size of  1.413" (35.89mm)

There is also an issue with the size of the square base relative to the height of the buffer beam. The square face appears to be a little larger than shown on the plans. The top of the square section is slightly higher than it works out on the model. There doesn't appear to be a way to fix this because any change to the size of the square would make the centre line of the buffers higher. It does make the position of the four bolts that hold the step in place look too far away from the buffer though.