Sixty-four Pixel Colonists

So for now, our missing bioogist and resource production are the more importnt issue but in case the building space becomes an issue in the future, assuming we manage to get some decent plasticarbon production and/or mining going, I have to ask:

Besides the 2D pixal graphic art and the incresed resource costs is there a reason we couldn't build buildings with multiple floors ?
(I would assume gravity is likely inferior to earth considering, weight is likely less of an issue and Shiva use of the moss topology actualy give us a clever idea to create biger building for lesser resource costs)

Somethng like thatShow

Going for the basis that a full on one story habitat cost twenty plasticarbon. I'm gonna say 30 to 40 plasticarbon seems a reasonable estimation for the basic infrastructure
Adding 1*
0 for the solar power array and 10 for the compact tank, I think the whole thing could cost like between 50 to 60 plasticarbon (not counting the actual modules in each floors)
Expensive but seeing as we'd get basicaly the utility of 4 buildings for the surface place of one/one and a half, that'd be a way to save space.