I would cry tears of joy. I would make my own systems and I would try to challenge my skills as more as possible
Anyway, SE is slowly getting those features. Also a spaceship editor is planned:
QuoteSpaceEngineer ()
Spaceship builder with physical testing of construction
Maybe he will integrate SHW's ship editor. With some edits that would still be awesome and very funny to do, also pretty near to what was KSP in the beginning.
The universe is not required to be in perfect harmony with human ambition.