Gorgeous Falcon! Probably not the answer you're hoping for, but since no one else is chiming in... Have you considered deleting the front upper windows by covering them from the inside? You'd leave the windows installed for the appearance factor as viewed from the outside, but simply cover them insulate over them and cover them from the inside.
Also, I personally have found that trying to thoroughly insulate an old van is almost a futile project. Of course, you'd want to hit the big areas on walls and on top, but there are so many areas that we can't reach easily, that I find efforts better spent on good ventilation for summer and a good propane heater for winter.
I hope someone else in here will have better advice for you, but there's my opinion, just in case.
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