I have one too but I haven't used it yet other than for display purposes. Mine is a Thermador, and the body of it is made from sheet metal. I can take measurements for you if that would help.
You don't want it to be heavy as in most designs a portion of the weight is on the window glass.
This article has a lot of good cutaway photos and information that may help you.
Here's The Science Behind How Cars Stayed Cool Before 'Real' Air Conditioning - The Autopian
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