Im sure ship interiors will start to sky rocket once actual gameplay elements start being introduced. things to do while in "dave mode". currently development is still being focused on ship building, as that is this games greatest strength. (still alot of things to be done, like the fabled HP system, thruster revamp, and possibly another weapons overhaul, oh and did i say RAILS!) however once ship building is basically done, we are going to get a slew of "survival updates" things like mobs, requirements for dave (food, water, air ECT) craftable weapons and body armor/power suits, and probably a whole plethora of survival elements that will surely make interiors a necessity to some extent.
so interiors are coming! (TM)
also as a side note ill be making a new "interior design" episode from my building cities series. ill post the link here when im done (might be a few days) ill be going over different things i have been doing and have learned in under taking the daunting task of giving interiors to all the buildings in my city. my of them should be easily applicable to ship interiors.