Sheesh, I am one cheap SOB. Can't stand paying hundreds for a sink. So I find this Suneli 1815 undermount sink for just over $50. It's about the right size and I like the 7" depth. So as part of making the new counter top (the particle board "prototype" lasted 7+ years, which is waaay overkill), I thought a sophisticated undermount would be just the thing. When it arrived, the top flange looked so attractive I thought I'd try making it into a top mount.
Undermount sinks have no cleats for pulling the sink down
to the counter. I used some resin left over from the Pygmy kayaks and glass to attach some homemade cleats. Making the cleats required some 1/8" scrap, some 5/8" X 3" strips of 0.040, and a vise. Then the paint on the outside of the sink was roughed up with 80-grit and the cleats were epoxied on.
The flange on the sink is so attractive [to me] that I decided to take a big gamble and expose it, flush with the counter top. This required making a template and using a pattern/template cutting router bit to relieve about 3/32" into the plywood. The template was drawn using the sink, but was cut with a sabre saw and then filed/sanded to as perfect a fit as I could manage, manually.
After that, installation was a snap. The relief area wasn't perfect. There are gap variations of maybe 1/32", which doesn't sound like much, but it's easily visible if you look (that's the risk of doing an inlay, I guess). On the other hand, for a first time using a router like this, I'm giddy happy. The J-trap, as in all my other sink installations, is recessed back towards the shell to allow for more drawer space under the sink.
The slight "S" curve edging (cherry on the burch plywood), where the counter gets wider, was cut using the same template idea. Why not go to excess when you discover a new technique?