According to the Baader blurb, The Hyperion Zoom has click-stops at 8, 12, 16, 20, 24mm and remains parfocal (I do not have one). When I was researching the Hyperion range I read on another forum (
http://cs.astronomy.com/asycs/forums/t/26225.aspx) that the Hyperion range are parfocal but I'm not sure about the mix 'n' match frankenstein.
I believe, however, that you can get a 'parfocalizing ring' which can be used across a frankenstein set.
Don't forget to ask for the bolt that goes in your neck, though! (ha ha )