Just thought I'd share my experience on the build tonight. I was hesitant on tackling the windscreen because I've never done it before. I started with building the jig as per the book. I'm using 1/8" thick 3/4" channel. My corner radius is 3 3/4".
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The sides were cut at 90* to compensate for spring back. I cut holes in the jig for wood clamps. I used the Sharpie pen trick. Marked the surface I wanted to anneal with the sharpie, used a lazy flame on the oxy/acet cutting torch and with the flame 4-5" away moved across the surface at a lazy speed, heated the aluminum on all 3 sides till the black sharpie turned light gray. You can see the black on the ends and the gray where it was heated, this works very well.
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I made a hump in the middle of the jig for giggles and sh1tz, more for looks that anything. This area was annealed then clamped down.
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I then greased the sides with coppercoat lubricant because us guys all know lubricant is a good thing. A little elbow grease and the bend turned out very nice.
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Instead of moving the 'bender' to the other side of the jig, I just removed the aluminum and reclamped it and bent the piece using the same corner. That way they should be identicle, maybe.
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A quick fit on the 7, I can't believe how the windscreen frame adds to the look of the car. Very happy with this nights results.
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Don't talk too loud photoman or else everyone will be getting their fenders from Fenders N More. Gotta love them.