Years ago I had a VERY EARLY Trek 2500 - basically the first year of that frame, equipped with full Dura-Ace (7sp), nice Cinelli bars/stem and other goodies like a nice seatpost. Unfortunately the frame delaminated at the downtube/bottom bracket junction. Word on the street was that they fixed that problem in the later frames, and this is one of those later (95-98) frames, so you will probably be ok.

And I don't think their is anything "wonky" about that fork. I suspect it is actually a threaded carbon fork which they did start putting on those later 3-tube carbon bikes. "Airail" was a name for Trek's in-house carbon forks from about that period. It is clearly painted to match the non-carbon parts of the frame, so I don't see any reason to think it isn't original.

Oh, BTW, in those days a "carbon" fork just had the legs themselves made of carbon, the crown, steerer, dropouts, etc. were all metal. All-carbon forks didn't come along until a lot later.