helo, im now found the engine and im like, im want to question how can im make a space? a solar system? if im need a can be explored spacecraft can im make from 1 model the all space? (outside and inside) and if im want in spaceship some object to useable (switch,buttons) im need made an other model? for example im want to player can sit down the seat im need an seat model? or ok if the spaceship model have ? thx for answers

any answer?

Everything you plan on customizing without the engines help needs to be either models or programmed cubes etc. This you should know.

A space system can easily be made by changing the environmental options in the editor and load it by codes.
I would also suggest for every different switch / button you create a new model.