Add my name to your appreciation list - I spend too much time thinking about trying to do stuff like this, and not enough time actually doing it. I have a similar low head creek here in Oz so look forward to your progress reports.
The ?Ampair picohydro unit is interesting. I was thinking about trying a homebrew Mitchell/Banki (maybe using a F&P rewire) but a little worried about the diced fish, and losing the lot in the frequent floods we get here. How is it going so far??
Your ram pump is great - I've always been fascinated by these (spent some time thinking about how they might be used to convert a low head site into a higher pressure pelton option - but ultimately remembered the KISS principle) - What design did you use??