Been working upon this for a while, measuring 73913 when able to and working to a set of drawings I managed to get of a similar machine (closer to 73919)

https://twitter.com/JohnnySpanners/status/1470172111696429058

Hoping to get the parts printed in the new year, been desperate for a model of our machines at work and they just aren't available. Would be happy to help Bachmann if they chose to replace their aged HO scale 07 model...