I've been thinking about making something in 1:35 for a while, since like Tanis's 1:48 this allows a wide range of good quality cheap figures, vehicles etc. from the military modelling community. A representation of 60cm gauge using OO/HO track and mechanisms isn't that far out of scale so it's relatively practical from the railway side too. So I went looking for modern narrow gauge industrial stock to build and found Schoema, a German manufacturer. I knew about their Feldbahn locos, but didn't realise they now mainly concentrate on locos for mining and tunnelling projects. (Incidentally does anyone know a way to post o-umlaut on here? ALT-0246 and ö both didn't work...)

Their stock has a fantastic functional aesthetic which is also quite friendly to modelling - no tricky curved bits to worry about! After a lot of searching I found this one, which is pretty small but has all the right features:

Image from de.wikipedia by Reinhard Dietrich. Public domain.

I've made a drawing (from perspective photos, so it's likely not that accurate) and that scales out nicely to match the Bachmann On30 trolley wheelbase at 1:35. This means I get to make a relatively accurate model as opposed to a might-have-been. The gauge will be a bit narrow, but they produce them down to 750mm gauge (and the gearboxes are narrower than that, so they could probably make a 600mm version if they really had to )

So far, all I've done is cut out a few frame parts from 2mm styrene, and have yet to pluck up courage to do all the shaping. Once I have something more than a small collection of rectangles I'll try and post some pictures.