Hello Geeg,
I work at a woodworking company in Nicaragua and we also have electrical dry kilns in shipping containers, however, we don't have any added insulation, our temperature fluctuates a lot during the night, would you say it's necessary for a shipping container?
Secondly, your louvered vents look very nice, we do not have an automated kit but want to improve our system, did yours come with the kit or did you make them automatic yourself?
thirdly right now we have a Nyle are you enjoying the KD250?

Thank you so much! hope you are making your wife beautiful things.