It's got a lot about designing the subsystems like engines. It's not just popping a block that provides power. Also the guns. And then the sensors. And then put it in somehow. Space Engineers is more simplistic. Unless you want to design exotics with gravity or such.
The challenge for me, is to design & build something that has a place in my gaming world, but that can do everything in survival mode. I'm not saying players need to play SE as it 'should' be played ie, work yourself upto building items via mining the resources etc (there isn't a way a sandbox game 'should' be played, other than the players way). Mining resources can come later.
I play from the perspective of a game like ED or Evochron, for instance. Meaning that the world is pre-built (by me, for my gaming, obviously), then these items that are built, whatever they are, are placed into my world to serve a purpose and most importantly of all, can do that and survive, in survival mode (realistic setting). Then I feel I've played the game for my enjoyment the way I want to play. I'm still building my world, although its on hold until they finish messing around with the newer physics..
Beautiful thing about sandbox games, is play it your way. It can be played as simplistically as you want, or as complicated (in a good way), as you want too. Simple would be building things that don't really need to survive in a realistic'ish environment. On the other hand, building things that, can be built without the need to do that from an initial survival point of view. But instead from the point of view I play. That is, the world I'm going to play in, is already advanced, with items already built (by me, without too many mods).
Resources need mining, gathering & further building etc, can all start after that, to keep everything ticking over, but I don't play from ground up. I start several years in (if you like)..

Man has put down his 'welder' and only picks it up when he needs too.. [yesnod]
Might make no sense this post, to anyone that doesn't play it. But I tried..
