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get a piece of 2024-t4 aluminum sheet and start working that. I like this chart. Stay away from what is commonly known as "aircraft" quality
The 5000 series is probably best all around for a fender.
Clay
I agree with the above - 5042 should work well, you can specific the temper as well (H number). THere are a lot of aluminum alloys with very specific properties, not all suited to cold working. I do metal spinning and usually use 1100 series H0 temper, the metal starts out very soft but is much harder by the time I am done working it.
OK guys, I'm gonna source some 5500. I'm working this by hand, beating it over a wooden former using a setection of mallets and hammers.
So does anybody know?
What thickness I should be able to shape in this way? Bearing in mind it's a little more intricate than a standard fender, so it will get stretched and thinned during the process?
How long can sheet be worked after annealing and how can I see stress developing before the work piece cracks?
I'll be adding some Phots tomorrow so you can see what a farce I'm having with the whole affair 
The path of excess leads to the Palace of Wisdom
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