Running well there Nick
I have 2 by 54r here
1 full size and 1 1/2 size for something different.
I have seen your 1/2 size and it's very impressive! Did not know you had the full-size as well, probably made building the 1/2 scale easier than from pictures.
I acquired the full size as boiler , firebox , engine with 1 cylinder and no flywheel.
Was easy to make a base and standards lineshaft etc
Hardest parts was getting flywheel measurements. Had to call in a lot of favours