Creating a perfect fake of a person isn't really that much of a feat in general: most of the usual players in Trek ought to have the necessary tech, either by Trek precedent, or then simply because the tech already exists today here on Earth.
Say, it should be pretty trivial to perfectly recreate the exterior of O'Brien or the interior of NCC-1701 visually: the visual recording techniques for that are available to us today or will be in the near future (say, next Christmas). And humans are highly capable of fooling themselves into believing when what they see is approximately right. Both O'Brien in "Whispers" and Kirk's ship in "Mark of Gideon" would be well on the safe side of the uncanny valley, and the rest would be standard con man stuff.
Changelings probably don't have to rely on fancy cameras to get the visual appearance 100% right, though. Odo may have been born with the ability - and even without any formal training, when he gets a seagull 100% right visually (it's a real seagull!) he feels the need to grumble that he still is way off... A trained adult could only ever do better.
Having a Founder agent tag along O'Brien for fifteen minutes might well suffice, then, at least when combined with it next waltzing to a comm terminal and successfully pretending to be a legitimate downloader of the Chief's personnel files or the station's visual logs or Quark's peeping Tom files...
Timo Saloniemi
Say, it should be pretty trivial to perfectly recreate the exterior of O'Brien or the interior of NCC-1701 visually: the visual recording techniques for that are available to us today or will be in the near future (say, next Christmas). And humans are highly capable of fooling themselves into believing when what they see is approximately right. Both O'Brien in "Whispers" and Kirk's ship in "Mark of Gideon" would be well on the safe side of the uncanny valley, and the rest would be standard con man stuff.
Changelings probably don't have to rely on fancy cameras to get the visual appearance 100% right, though. Odo may have been born with the ability - and even without any formal training, when he gets a seagull 100% right visually (it's a real seagull!) he feels the need to grumble that he still is way off... A trained adult could only ever do better.
Having a Founder agent tag along O'Brien for fifteen minutes might well suffice, then, at least when combined with it next waltzing to a comm terminal and successfully pretending to be a legitimate downloader of the Chief's personnel files or the station's visual logs or Quark's peeping Tom files...
Timo Saloniemi