When I get my cnc going I'll try and challenge that, I think the main problem is in evaporator, and I got some great idea for huge surface block which is needed for this kind of cooling, but like I said cnc is needed and I can only say 2mm milling bit action
And we got Danfoss company here in Slovenia and I know a lot of people who is in this bussines so I think I can made unit that will be hopefuly even better then Prometeia