hmm. yeah. tokamak could handle your physics pretty well as well - depending on how realistic you want it. in real life their is alot more sliding around in space. For different ship designs you could also mix collisions ie a sphere in the back, and a cylinder in front etc. This is cool because you can also simulate blasts from rockets, lasers, etc. with the tokrb_applyimpulse2 command which applies a force at a location, at a direction.