Josh - I know the extra jar on top complicates things, and makes it harder to make a physically stable and sturdy unit, but IMO that is an ingenious solution. You could be onto a highly accurate, consistent flowing, inexpensive auto dosing setup.
And while turning jars of ferts upside down, setting them into other jars, sounds a bit messy, you wouldn't have to do it often. I've been auto dosing for about a year and a half, and you would be surprised how long a liter or so of macro ferts goes. A liter of micros would need replenishment so infrequently it's ridiculous.
Great work! Looking forward to progress.
Steve - 33g reef and a 180g planted in need of a re-scape.