Those are very sweet bikes! DH and I came very close to getting them - and then decided on Lynskeys (which we love).

I don't think I'd do Disc brakes because of 1) weight and 2) field serviceability. We ride v brakes with koolstop salmons and no issues whatsoever stopping. I probably would put fenders on (or you could do the trick with the wingnuts and take them off and on if you have lots of dry days in a row). I think they carry your bags, yes? You could always stow them with your luggage. I wouldn't want to risk multiple days in a row with rain and no fenders, though.

Whatever your decide, enjoy!!