The Muppet show....love it!!

Anyways, the wood prototype is basically that...a prototype, to prove that the part can be made. The aluminum part will basically "hug" the outside of a round metal pot
which will allow the other side to conduct heat from a peltier cooling/heating device. That is the reason for the curved part. I somewhat agree with you regarding the vertical mill and using a boring bar. We just cannot visualize it. We do have a Grizzly Mill....with indexing: G0619 6x21 vertical mill. We've never done anything with a boring bar...an idea to possibly try. Our finish required is not super important...just can't have a real rough finish or the part will not have great contact with the pot and the conductivity will not be as efficient.