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There is a Tri-Motor in 1/48 by AJP Maquettes. it's lovely but you are paying for the privilege - it's 130 Euros...ajp-maquettes.com/Dossier Anglais/Lignes anglais/AJP-Collection Lignes - FORD Trimoteur - anglais.htm
Love your choice of diecast airplanes and the paint schemes you picked. Those should be easy to modify without a full repaint of the whole airplane. The Lockheed Air Express is especially Pulpy due to the combination of the modern (for 1929) Vega fuselage with the retro elements of parasol wing and exposed pilot position.I'm with you on the size. I understand the contrary perspective of Fram and The Virtual Armchair General. But given the height and bulk of modern "heroic" 28mm, the added height from the bases, and the wide availability of 1/43 scale cars, I think these bigger airplanes usually look fine.
I'm glad you found what you wanted, but a response would have been appreciated.
If your out to use vehicles then the bigger table is really useful to get a good car chase going.
Alternately there's the scrolling scenery/static cars option.