My take on 3D asteroids, inspired by Jokerounet for the sponge technique and RodentMaster for the bases.
There is a magnet in the base to allow removal for transport and during a game, and both sides of the asteroid can be used in a competitive setting.
Quick tutorial on the blog : http://rule37-ica.blogspot.fr/2014/05/x-wing-attack-of-sponge-asteroids.html