I recently got a 2nd hand BiFri Tikit they use a 24 hole 349 rim ... with an IGH They built wth a 36 hole hub, skipping 1/3 of the holes..
Older bike in 41 has a 20 spoke front wheel .. Schmidt builds a different 20 spoke wheel around their New XS hubs hubs..
so 20, 24 and 28 spoke fronts , 24 and 28 spoke rears are on the choice options..