John,
Windshields are not the problem, Larry Stock has reproductions, it's the Mangusta side and hatch glass that is pretty non existent. Previously there have been a couple of specialist and one off maufactureers mentioned in the Mangusta community, althouygh maybe you could consider lexan on your build? Larry Stock's business is a combined Pantere Parts and Polymer Plastics, he formed me some front quarters for the Pantera out of lexan.
There have been a few project Geese sold in recent years, but they are a rare animal and values have risen over the time too. There was one avid buyer Jerry (Mangustaman) in Tempe, AZ that was bought up a few projects at one point (The Tahoe disassembled project and the rusty shell from the East Coast). I think he ended up with at least four Mangusta's, so he may be worth dropping a PM.
Julian
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