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To add my 2 cents to the multiple replies;
any self tapping wood screw will go through thin sheet alu, and if it's not for some kind of precision engineered work of art (which it doesn't seem to be) then I think you'll be able to live with the slightly ragged hole this might make on the inside... so I personally wouldn't bother fucking about with clamps or presses but maybe I'm a horrifically lazy cunt.
I've just purchased a sheet of aluminium to act as a kick plate beneath some bike hanging hooks.
http://www.ebay.co.uk/itm/400887416706?_trksid=p2060353.m1438.l2649&var=670430341431&ssPageName=STRK%3AMEBIDX%3AIT
It will need holes drilled in the four corners to attach it to the wall, and I am guessing that, although I have the relevant bits, trying to drill through this with my battery powered electric drill is going to be a futile and frustrating exercise? Has anyone drilled through aluminium sheet like this before with relative ease? If not, can anyone recommend somewhere friendly in North/East London that has a drill press and that wouldn't mind doing it for me one Saturday?