Hi Dave, the reason that the metal has skewed is that you need to "shrink" shrink the flange for convex curves and stretch the edge for concave curves. The result at the bottom of your picture is indicative of not shrinking the edge. At the top of the picture this is also true but it looks like you did not hold things tightly enough against your forming block.
I have a book on this some where, I'll see if I can find it and email you the relevant page.
Also there is a guy over on "LocostBuilders" who did the whole body of his car in Ali - bit of a legend by all accounts - might be worth a post over there.
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