...and, annoyingly enough (but perhaps reasonably) you won't be able to refit the ship at all unless you replace all the non-understandable components, IIRC; you can't make a design with tech you don't understand, and refits are between classes, not parts.
Hence, if you're not Psychic and capture a nice ship with things like Allegiance Shifters and other psychic foo, but Ion Engines I
, you can't have it both ways; either you keep the slow engines, or lose the psychic gear. And so forth.
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-- The thing that goes bump in the night