I would think cloning that board would still cost more then buying a used one on ebay correct? Cloning works when demand (and there has to be quite a bit of a demand) is enough to recoup costs of manufacturing plus profit.

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The 68030 chip alone costs far more than a PowerCache usually goes for. Repackaging existing PowerCache's is certainly possible, but does not increase the supply of upgrades available.

But, if you're going to repackage a PowerCache anyway, why not just turn it into a PDS card which will plug directly into the SE/30 socket and support one or two additional cards with the connectors positioned in the most convenient locations?