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The dual pane barely would fit length wise its 31"x48". The length gets you to where the back part of the roof begins to drop off . The real problem would be the curvature. The new minis roof is fairly flat while the classic's roof has a pretty nice arch to it. Not to mention that the classic would handle like a jeep cause it would be top heavy.
Or you could be on the lookout for a proper Webasto folding sunroof... If you ever go to Mini swapmeets or British Car shows, you'll often find one in somebody's parts booth. I know *I* want one.