Ideas

Hullvoxels have a certain number of hitpoints. When hitpoints reach 0, the voxel itself is destroyed/explodes

voxels have an explosivness value, which determines their damage to adjacent voxels when hit

Ships have different parts eg cockpit (destoying makes ship useless) thrusters etc

On Collision of voxels: HP are reduces until one collisionparty is completly destroyed:

On Collision of voxelclusters: Impact depending on mass of voxelclusters, corrected by shipengines. This results in a short hit effect when being hit by a bullet, e.g.

On destruction of voxel: Explosions caused. Hullvoxels just disappear, weaponarsenals cause heavy explosions

Sprite rendering for lights...