There is a custom block in use on my server, a variant on force-fields from the Immersive Blocks mod. These blocks have 250 hp and 98% armor, but are non-physical. What this means is that they resist AMC all day long, but missiles go right through them. You can walk through them, or fly ships through them as well. Since they use the "water" texture, they look REALLY cool using the realistic textures. They are great for strategically armoring your core against drilling, or all manner of decoration.