keep an eye on your MOIDs, because for each block you place you gain a MOID.
these are as indestructible as i can be bothered making them.
a skirmish of an hour didnt leave a scratch, though they're succeptible to deepgroups that are
larger than the entire block. for that reason, the planetkiller etc will still work, probably.
but whatever, enjoy your self repairing invinciblocks