Building in General

[Facebotter]

How in-depth is the building mechanic likely to be? The trailer looked very promising, as well as building ships and structures, but;

 
Will you be able to build a free-floating structure in space? Would that structure be effected by physics, e.g. if someone knocked it out of orbit (assuming space-structures are effected by orbit as well!), could that specific space station come apart and fall planet-side?
 
Will all buildings be fully destructible?
 
Will we need to craft our own items? If so, what will crafting look like? Will it be simplistic, unable to create complex items, or will it be advanced and open?
 

Sorry for all the questions, these are just a few of the ones that popped into my head as soon as I saw the (fantastic!) trailer that the devs put together!