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are you sure? it's solid. I'm putting mines in the door but it's an idea for building a box. It's really light...maybe thicker aluminum? I doubt there is resonant..
Any material can resonate if you touch upon the right frequency, Using aluminum is possible but not in its raw shape it will sound harsh, have an echo, and at certain frequencies will resonate. However if you chose to build a speaker enclosure out of aluminum which IMHO is not cost effective nor easy you can, but u would need to sound deaden the aluminum with quite a bit of material in order to make it sound decent. So your weight for the enclosure goes back up to within the range of mdf or wood and maybe even slightly more.
dynamat is a good idea. Unfortunately, my stomach needs the rice more than the ears does and I'm not about to cut and dynamat that...maybe during free time.