Homemade frame for Water Drop Kit and how to guide

Hello, your post is sooo useful. Just a couple questions:
I see you have a long distance between water reservoirs and valves, is this to increase water pressure? To which purpose? Get bigger drops?
The camera is placed at some distance (more than I have been using), besides avoiding splashes, are you doing this to increase depth of field? I found hard to get everything in focus when I get a wide "wheel" or "crown"

Great setup and even better photos. Would you be able to share more details of how to build this water droplet setup , like what electronic controller did you use , valves etc . ? Many thanks.