That’s my biggest ever piece of rolling stock more or less done. Thanks to @Paul 34Ffor significant information input, and @Northroader for the correct bogie sides, which I have squeezed out to 36.75. Very unusual coach, with both compartments and open sections. As with all my models, I’m quite disappointed with it in many ways but nor is it a complete failure, I suppose. Roof looks better in real life and a little more filler some weathering will smooth things out. The roof was horrible to do - a high arch - so ended up making a balsa layer structure and then sanding to shape.
Corridor connections are temporary until I can get the correct ones sorted. Should look ok with the PP….shout out to @Mol_PMB and @Maynerfor construction advice.