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A 6 wide roof was easy, but I haven't yet been able to workout a 5 wide one

Amoreternum, are you talking about these hinge bricks? https://www.bricklink.com/v2/catalog/catalogitem.page?P=3937c02#T=C I'm having trouble imaging exactly what you mean, although I'm sure a 5 wide roof would look better

Although the shade of blue does not quite match 'Danka', I think the shape of the windows in this revision are much better.

Attached are renders of my (simple) MOCs of 'Vlasta', a Czechoslovakian ČKD T 211.0, and 'Janko', a cargo/service wagon from 1912. They are based on stock that runs locally on a meter-gauge, historic railway: https://www.detskazeleznica.sk/-vozovy-park Photos of Vlasta and Janko can be found under 'Motorové rušne' and 'Vozne' at the link above. 'Janko', will powered with a PuP controller and motor (which was unavailable in Stud.io, but the upper is built to clip straight on) Constructive criticism and suggestions welcome.