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tallsam
I agree with slothy, it does indeed look like a square taper crankset, and that would most likely make it a 68 mm bsa shell.
The Tiagra 4700 and 105 5800 cranks will both fit a 68mm bsa shell with the right bb cups. The rear spacing of that frame is probably a standard 130mm, so unless Trek fucked something up badly, those cranks will definitly fit. I've got a 4700 crank in a 68mm bsa shell + 130mm rear spaced triangle myself.
Unless the nostalgia is the main reason for this project (and that would be totally legit), you should consider what other and better frames you could get for the cost of the Trek frame + respray. As far as i know the 1.2 was at the bottom of the line up, and a pretty generic alu frame.