The downside to aluminum is that it is a good conductor of heat. Although if its insulated, it would be fine. I'm not sure if it would make much difference, probably a few degrees...
FWIW, i'm using a home-made plexi-glass heatshield... It works well...
1999 Mystique LS V6
Alpine CDA-9807, Rear deck sub, Opt. TB, K&N RU-3530/MAF adaptor, custom heatshield, FSVT 17's, SCT 4-program chip, Eibach's/ST200's, Hella Fogs...
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