I am planning on building one eventually for my big tank. With planning for anthias and seahorses, need a way to dose various foods continually. Planning to do a couple dosers, with a small refrigeration unit so that I can keep larger containers and not have it spoil quickly. Plan to eventually dose pods, phyto, and frozen mixture of mysis, brine and some other coral foods.
For frozen foods, you want a large ml doser. Have seen people use the brs dosers with a larger tube in it to accomplish this but I may end up building my own dosing pump so I can size it how I want it. The phyto and pods though will just be standard brs dosers.
In my space, the hardest part of this setup will be finding the right frig unit as I need it to fit up into the rafters above my tank so that I mimize the length of tubing needed and there by further reduce the risk of the food spoiling in the tube between doses and keep food quality as high as possible.