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Tom,
I'm pretty sure that you're going to have to glue it. Cutting it without a solid backing will resultin in tear out of the laminate. However, I think this works: Cut your hole in the plywood before gluing the laminate down. Cut the hole exactly. Do not cut the laminate, but glue it down. You'll get some adhesive on the open area but you can renew it later for another project. Put a straight bit in your router and tip it down into the laminate in the hole, near the edge of the hole. This cuts your starting hole. The chuck your trimming bit and cut out the hole, and now you have a piece of laminate, shaped like the sink, but without the plywood backing.
Also check wood working websites and WW magazine sites for more tips.
John
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