[vastinfest]

This is a very cool idea indeed.

I looked over their Kickstarter and link to CAT engine itself, but only got confused. How are they going to change direction of the craft itself (I'm not sure what's the proper "space" terminilogy for "turning left or right is")? Or that is not needed?

[XorNot]

In space you can just spin a gyroscope faster or slower to rotate. No wind-resistance means you don't need a particularly heavy gyroscope to do it even.