I'll have to go tinker with these pointers in mind. Thanks for the tips!
Come to think of it, maybe what I'm actually after is a way to turn a viewport arrangement into vector graphics. Objects are already made out of connected points and I dig the flat colors, so you could scale at any resolution you please as a middle step OBJ -> Vector -> PNG.
On that note actually, do you use any special light settings or rendering passes? Or just a top down 45º rotated sun?