Hi Bob,
Welcome to the boards!
I really love my X700 and can take measurements of whatever you'd like. I think some clarification is in order first, though. See, mine is a '94, which was the introductory year. At its inception, the model was basically a solid, carved top version of Guild's X-500 model, however, sometime around '98 or '99, Guild redesigned the model under Bob Benedetto's guidance.
You mention the guitar being a late '90s example, so it could be either the original spec. version or the Benedetto spec version. Now, that aside, I'm not sure whether or not any of the exterior dimensions actually differ b/w the two. I think the changes may have been more in the area of bracing/construction/f-hole shape... that kinda stuff.
Without taking the guitar out, I can tell you it's 17" wide, neck is fullish and round, but not a baseball bat, nut width is normal (not particularly wide or narrow), guitar isn't a feather-weight, but it's not shockingly heavy or anything (no hollow guitar will be a boat anchor like a Les Paul.) I'd guess somewhere b/w 6-7 lbs, maybe? (Actually, weight is the one thing I can't help you with; I don't own a scale)