After a decade and a half of watching, waiting, and semi-regular efforts at research, I have yet to see evidence of any "Penobscot bow" with the double limbs that have been authenticated by a historian of any reputation.
But to then bastardize it even further by making it out of effing-glass is travelling deep into the Land of Absurdity, in my opinion. Frankly (there is a poor pun there considering the oldest extant Penob' bow came from a white guy that claimed to be Penobscot, named Frank Lola or Frank Loring), this just smacks of low rent cultural appropriation. It's disingenuous.
I can see making one from all natural materials as a study in hypothetical historical reproduction. And if it shoots well, fine, enjoy it. But please do not wrap it in fallacious legend in hopes of building a credibility where none can exist. Let the bow honestly stand or fall on it's own merits.