I expect to get a belt through the joint it would be a 2 person job. I wouldn't expect much of a difference compared to a big-wheeler since the Swift seatstay and chainstays are same or similar in length.

For 5'8 I expect the default medium size would be best. Thee are 2 options for the stem riser, one the curved integrated stem which does not give you options for reach adjustments, and a straight riser same as the Swift version, allowing the use of a stem of correct length. If you know what reach you prefer, a curved one with your reach requirement can be spec'ed. Basically around the basic frame, *everything* is customisable.