Small tip, you might want to ground that rack just in case. Nice use of the insulation under the mats. Are you going rheostat, on/off regulator, or proportional?
PS how many chams are you feeding with that much production?
I'm using a rheostat, I only have 3 chams now but wanted to get all the feeders going before I got more chams. I am planning to breed a few different types and and will have everything ready before I start breeding. I should have a total of 9-12 soon as I am looking for them now. I have made a deal with a local bait shop and they will take all my excess feeders (and pay me for them ) until I start needing them for my own use.