Difficulties Installing ABS Headliner in 73 Swinger

Being a one-man band with a homemade specimen I had quite an operation going.

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Pretty much how I do everything. Remodeled the kitchen last year, held the cabinets up with one hand with a level sitting on the shelf, the other holding my drill. The 60lb microwave was the hardest but believe it or not everything came out together and level. (yes, I'm aware I'm completely off topic)

I've been considering making my own headliner for awhile now after I had seen the prices for a new one. I have a crumpling foam one, but still in good enough shape I can trace it. If I could find a large enough polycarbonate, I can use a heat gun to mold it to a rigid shape and end up with a hardshell.(i build a computer case this way last year)