Re: Was the Enterprise A actually the Yorktown?
Same here. In fact I remember reading that they couldnīt have shot the holodeck-scene if it hadnīt been for that fan-built section (because the budget on "Relics" was at its limit already), and that everyone involved was really happy that they got the opportunity to use this set and shoot the scene. It was in a "Relics"-special issue of the Official Fan Club Magazine, IIRC.
But I may be misremembering of course - itīs been about 20 years since I then, and this brain is starting to get old
"Do you give me attitude, Spock?" - "Iīm expressing multiple attitudes simultaneously, Sir. To which are you referring?"