Well, I think I'm going to think about the mounting for a while. Couple options in play. The block unit separates nicely, so I do have the option of mounting the bottle where convenient and the light where effective. I probably will go with the bottle mounted behind the fork on the left side w/a spanninga fork mount and the light somehow hung from the the rack light mount on the right side.
That is, unless something better presents itselff while I"m futzing around in the garage.