I am getting ready to order a system myself for my 79 body. The only thing I can say in response to your mock up, is that the actual unit is not a rectangular box, so you have more room than you think. I did install a vintage air system in a 79 about 6 years ago. The thing did fit under the dash, and the ducts were very flexible.Unfortunately, I did not take any pictures. Glove box is a right off!
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