Pathetic, I really wish Space Guy had never released those damned laggy sons of bitches. Anyway there's a way to make a climbable ladder with bricks. No impulses or anything. And unlike impulses you can actually control the rate at which you go up, stop, and descend. Sadly I haven't gotten around to making a tutorial on how to build them yet. It's somewhat of a glitch exploit. But for now I'll tell you this much:
A ladder can be made out of 1 by 1 print bricks and flats. stack 2 print bricks atop each other then place a flat and repeat. To use the ladder simply crouch, hold forward, and jump. If you stop simply let go of forward for a second.
P.S. Yes I was the one who discovered this glitch... A long long time ago.