Volusianator
BoM Nov '07 & Jan '09
Holy Shit! Bob Staebell is a member here? Nice to see you here.Sascha,
Looks like you have fun project at hand. I am guestimating the overall volume of the humidor based on the pics & dimensions posted. With twin coolers (160 watts), you may want to stay with 1 1/2" insulation on all sides & 1" on the door panels in order to get a reasonable temperature drop.
Ideally the max delta T should be at least twice the average required temperature drop. Have fun with it. A zebra wood exterior will be unique.
Cheers,
Bob Staebell