Some back and forth with the manufacturer has told me a few things. The cable routing is fully internal, in the same way that the Aspero-5 is. That means that the steerer tube is D shaped, and for that reason, you can't order it without their stem, since it is made to fit the steerer. I'm sure you could use your own stem, however.
The fork also has flip-chips. It might be the case that they only have a single fork across all sizes, unlike the Aspero itself. I'm thinking this might be the case, because I asked for the fork offset, and was only given a single set of measurements (46mm and 51mm). Haven't confirmed it explicitly, though. You'd be good to go if you ride a size 54 and up.