Well, Mike Dabrowski did it by gluing thousands of 1" square mirrors to a parabolic dish. If you need the light sharply focused, your 1' square mirrors will be too coarse. I suppose you could break your mirrors into little pieces.
If you don't need the light sharply focused, then my first thought would be to use hardware, e.g. screws and clasps, to hold the glass in place.
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