Colludium / 
mattb
I see what you mean there Colludium. I struggled with this for a while but it's pretty complex and messy. Problem is first generating the physics objects, setting the angle, then applying the joint relative to that angle - which seems to for some reason cause all the objects to spin on the spot which then messes up the angle at which other parts of the structure are spawned...
So I've brute forced it using the pin to object which is a real shame as the forces are not relative to the core object it's entirely arbitrary. Also the structures aren't being generated, they're hand-made but you can get an idea for what I'm trying to do with this demo:
https://dl.dropboxusercontent.com/u/3317708/Space%20Lander%200.1/index.html
Use WASDQE to thrust in various directions, hold shift to stabilise. R restarts layout.
Match angle, watch the speed