You could have just taken the top off the barrel and put the pond pump in the barrel with a PVC pipe straight up to the sprinkler head in the barrel and eliminate the reservoir all together? Also could add additional misters in the line going up to ensure all the plants get equally sprayed. Most likely would still have to put in a drain to empty it out to replace your nutrient water occasionally, but great concept!
It's a bit messy, and probably not nature friendly, but had a neighbor just burn his diaphragm out by burning firewood in it for several hours. Black smoke... ugh.
Awesome job, the barstools are cool as well!
I actually bought them 6-8 years ago from homedepot.com I don't believe they stock them anymore but still have several other models available if you do a search for bamboo barstool that come up.
Looks great! Thanks for sharing