hmm, I have an idea, maybe make some sort of 'monkey bar canopy'. Perhaps have two layers of six in a sort of cubical layout. That way you can kind of swing around on the bars trying to get each other. Since I know nothing about making mods other than that you can only have 12 or 13 objects max, so the layout is probably up to you. Also lower gravity might be good.
It's just a little idea, it might work, but the limitation cramps things.