Class k and spectrum heavy mountain

[NW Modeling List]

Hi all,

I am considering an n&w kitbash effort. Does the group have any advice on
where to start if i desired to take a bachmann spectrum heavy mountain and
updated it to a 1950 (ish) non-streamlined class k....either k2 or k1? I
see one major difference in air pumps and feedwater heater.....anything
else?
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