1:72 will be just a tad big for HO. It falls between 1:87 HO and 1:76 OO.
I discovered Artitec when I was looking for a good steel piling seawall. (Didn’t we have that conversation?)
I’ve since bought several of their fork lifts and small detail items. Most things are made using resin and brass etched details. They are painted and weathered beautifully. Some items are unpainted kits.
They are big into military models of several eras and countries. I’m looking for a couple of Shermans that are designed to be flat car loads.
That’s quite a bit of super detailing. Like all the scences you’ve managed to use Artitec models with. Preticularly,the oiler cart and shop scene. Speaking of shop scene.
Auhagen a German HO manufacturer. Makes a great steam forge hammer kit. Number 80109 . If you get a chance Google that kit.
If you can find one – and it isn’t easy – Jordan Highway Miniatures made an excellent crawler in HO as the “Erie B-2 steam shovel,” which can be adapted.