There's a draft of my ship construction and weapon rules here
. I just updated with some changes to the weapons as well as the special abilities used in this battle.
Frictionless movement is here
although the concept of using actual bricks to represent the ship's vector wasn't part of it until I used it in a forum battle.
There's also a new-and-improved ruleset I uploaded to Brickshelf but it's awaiting moderation and I can't deeplink to it for some reason. It contains the frictionless movement section and new-and-improved weapons and special abilities.
I like Brag's rules a lot, though I'll probably stick with mine since they include a formal system for constructing ships, and because I'm more familiar with them.