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There is usually a good reason why thing are and aren't done in making optics, and there are good reasons for not making aluminium mirrors for amateur telescopes. I've seen this suggestion again and again but the aluminium is too soft and responsive to heat/temperature changes, plus I don't think you can get it smooth enough (I may be wrong, I'm working from memory, but aluminium was such a good product you would have to ask why aren't there more around - but you don't see them there must be some really good reaosns why there aren't!).
Again, I would highly recommend you join the ATM list at the link I gave above and the people there will be able to answer your questions.
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