These sturdy and elegant boards are made for us by a local game/puzzle company. They are formed by a black laser-cut grid affixed to a white base. Binary Homeworlds requires three Rainbow Treehouse sets, and the rules are in the 3HOUSE booklet. Rules for Twin Win, a game for a single Treehouse set, can be found online.
Having a board for these things is not strictly necessary, but they're really nice, and make games more portable.
There are many other games for the pyramids that which could use this board. Check online for more info.