I believe macmetex still has the 33MHz modules for a buck for two, and the 25MHz 520 modules as well. If you really wanted to go ahead with this, perhaps you could buy up enough of his to match the number of full '040s purchased, find someone to do the rework, overclock & test them, and then dribble them out slowly back onto ebay. If you can get the rework done cheaply enough, * there should be a tidy profit in it.

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True, it could make some money and excite may 5xx fans. But I don't have the money to invest in a project like this now. I wish I did, it would be fun. Experience has taught me to avoid other hobbyists helping to fund projects like this due to upset over delayed turnaround, a few ruined chips, and other variables. Better to put ones own money upfront and spring the finished results on people when the waiting and work are done.