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Where is that last photo from? your own handiwork @HHC ?
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Ha, I wish. I beleive it was found by @kenzo on reddit here.
If you're asking to gather details of the flange manking process for your GT then I'd look here. I think it bascially consists of adding filler to (existing) thin metal flanges.
I think @young_gun had an idea of how the picture above was done though bear in mind that it would make it super heavy.