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It's sewing darts into the edge as you go.

PF

I just had an idea. What if you tacked each layer to its respective shell in spots? That way there wouldn't be any thin spots because where one was tacked, the other layer would be full height.
I...

Hey man, an 8oz TQ and a 4oz UQ is kinda lopsided. The UQ will definitely be limiting how cold you can go. I would even go so far as to say you should reverse them (do the UQ with 8, and the TQ with...