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You may be right but in my point of view Nema 14 is not enough smaller nor cheaper than Nema 16 and 17. Nema 11 and 8 are noticably smaller but way more expensive and much weaker (also have problems with microstepping, atleast Nema 8 do, due to inductance).
I would rather use Nema17 20mm tall, than Nema14 28mm tall with the same 1kg-cm. In the end it would make reasonably small, cheaper and more reliable machine (in terms of compatibility with common stepper drivers).