For you HO modelers out there, I have a second space in my Shapeways shop for HO versions of the PRR Switch Machine and Air Valve. the link is here:
the PRR Switch Machine and Air ValveAnd these are the models:
I would be happy to add additional models with less ore more quantities that could be purchased and am willing to up-scale any of my other N Scale designs that make sense.
Design Ideas for HO can be requested here:
https://www.therailwire.net/forum/index.php?topic=37389.0