Rubber is used for lots of gaskets. The company Fel-Pro makes all types of "rubber" gaskets. Their Perma-dry Plus line is all basically rubber. Why doesn't CCC offer more rubber gaskets...... cost.
I like your idea.... but I'm really interested in how you plan to cut it and add holes in an effective manner. Rubber is hard to work with without a die to stamp it because it stretches so much when you try and cut it with a knife. I've not tried any of those sheets, though so it may be easier than I think. I'm also interested which product your chose, as McMaster sells more than one neoprene rubber gasket material.
Not to derail, just as a side note: I think most guys get all too hung up on the rear cover gasket. Silicone alone holds just fine. I don't have any issues with any gaskets on the cubs leaking once they have been fixed. I honestly don't understand why so many people change out a gasket just to have it still leak.
Please keep us up on how this works out!
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