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Thanks you guys! Your encouragement means a lot to me! Ben, I hope you can forgive me... Your heat sink needed to be "modded" (like your wife awhile back! Her leg done got broke!). Nothing serious. But to keep the integrity of the copper heat spreader, I am drilling a hole down the top through a couple fins, and then I'm drilling and tapping the top of the copper heat spreader, so I can bolt the heat sink to the heat spreader from the top rather than from below. That will leave more copper, and it's not fun drilling through 1.5" of copper.
I ordered some electrically conductive silver paste stuff ($25... gasp) to ensure a solid connection between the bus bars and the pcb. The bolting is probably plenty, but I don't know.. I just wanted to make super sure, and to increase the contact area.
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