Use of Old Bachman's 4-8-4

[Dreyfusshudson]

I have some Bachmann's 4-8-4s.
One is Old Tommy(Tomix)'s Hong Kong made version, which my father had.
And I have 4 Notherns produced after 1980s with reasonabpe prices.
I'm now learning 3d design to design shells, Like more detailed ATSF Nothern or NYC Niagara.
Hoping it is worth.

Well, it's sad that there's no 1880mm 4-8-4s in n scale, so need to Kitbash old microace's steamers...