A simple list of suggested multiblocks.
I noticed that mobs have dificulties flying in your ship. I suggest that any mob within a 5 block radius to this multiblock’s sign will be stored inside it during flight. Lvl 1 holds 1, level 2 holds 2, level 3 holds 5 mobs.
Object Tractor beam
Large multiblocks that sucks small wrecks and aestroids into a designated area.
Massive wall, like the water walls used by Cortesia Del Mar and Excercitus. However, those walls can be breached with a high enough cruise speed. This wall could be an item that is entirely impassible by ships over 500 blocks. However,it would be incredibly expensive.