I don't really know much about apron front sinks, but got a partial answer about sinks in general from the manager of a high end store. Kohlers, according to him, are one of the best brands of cast iron sinks. But the reason there are so few porcelain on cast iron sinks nowadays is that they consider the enamel ones to be "higher quality". Enamel is baked at a higher temperature, so has a harder finish and is less prone to staining. It supposedly doesn't mark as easily to begin with as well. But what I don't get is why they see all these folks going for unsupported solid fireclay and don't get that we want ceramic sinks! The thing about enamel is that it feels like a metal sink. It clanks :) I mean, if it's well insulated it won't clank during regular use, but if you knock on it it clanks. Porcelain, fireclay and the like clink. Big difference :) Porcelain over cast iron doesn't feel any different than fireclay (though some of the glazing feels different) but it's not nearly as prone to chipping and cracking because of the big heavy thick metal substrate :)

I bought the support kit (not Rohl) and all it was was white pipe like used in closets. I ended up not using it because the cabinet maker put a shelf in.

Can you explain what you meant by "Because of the width and length of the kitchen, I have opted to do an undermount sink instead of a farmhouse"? Does that mean that you think an apron front sink's size is an issue? You can get an apron front sink with a more farmhouse/traditional feel in several widths if your comment meant that size was a concern. I am thinking specifically of the Kohler Whitehaven sink which is enameled cast iron, and comes in 30", 33", and 36" widths. Furthermore, the Whitehaven apron front sink comes in both the traditional/typical apron sink height, as well as a shallower apron height for a less massive look. The corner drain also is great. I've had stainless steel sinks in past homes, and didn't like the scratches, water spots, and that it never again looked sparkly after about the first week or two. Kohler Whitehaven sink line

Elkay: In case you didn't believe this is a retrofit, here is a "before" picture. The new cutout has bisected the grinder slot that held the sink clip. That's the arc that is filled with stone and color matched adhesive. The plug in the front is the reinforcement rod slot having been ground back and filled. Not bad. I never point these out to the homeowner; once you do, she can never "unsee" them. Run this thread past your technical guys, please. I can't wait to hear the "It can't be done." The secret? Because the bowl is deeper than the apron, you have to tap the cabinet front off. If you put the sink in, you can't get the cabinet front back on. If you put the cabinet front on, you can't get the sink in. You partially put the sink in place, partially put the cabinet front back on, more sink, more cabinet front, until you're done. I never use your provided clips; all my retrofits are strapped in place. Throw a couple of Sink Straps from Regent Stone Products in the box instead, please. Keep making these please. They are moneymakers and the customers love them. Just under 3K.