I lucked out on eBay, bought it from this guy: http://stores.ebay.com/Doeringer-Custom-Guitars-and-Parts
Nice 6X9-inch piece for a total of $12 ... it was a little warbled, but it flattened out when I glued it to the plywood and put an upside-down table on it as a "press."

Thanks for all the compliments, guys! I'm so excited with the way it came out. My only concern is that I may have gone a little heavy on the Magnalac, which may lead to cracking down the road. But heck, if that happens, I strip it and try again with less. I'm going to add a section on my picture page that lists the process and materials (stain color and everything) ... that way if anyone wants to try a similar approach, it will be easy to reference. Hopefully I'll have time to update that tonight if I get a break at work.

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1987 300D, arctic white/palomino--314,000 miles
1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles
2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles
2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles
1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles
1995 S320, black/parchment--34,000 miles (Dad's car)