An Astartes Bolter would definitely be a unique acquisition, though the rarity would get knocked down to Near Unique if you had friendly astartes contacts.<br/><br/>And yes, I suppose the void Mistress is currently better at ship repairs than the explorator...  Makes sense, I suppose.<br/><br/>A good quality MIU will require an acquisition check at -20, which won't really be easy without exceptionally good rolls or the help of your Rogue Trader.<br/><br/>Each ship requires a successful tech-use test to repair, which will take a week per test.