I have constructed a normal sink base cabinet with 2" face frames. I left out the top rail of face frame and the mid-rail above doors is at the correct height for the apron of the sink to clear by 1/16" or so when top of sink is flush with top of cabinet (undermount). The sink is 33" wide at the apron and top and the cabinet is 37" wide. So with 2" face frames, the opening would be 33". The problem is that the sink needs to be supported from below the basin, although Kohler, the manufacturer, does not say this and their install guide is worthless. Below the basin are four tiny feet which are 3 1/2" in from the edges of the sink (apron and top rim) which appear to be where it should be supported. The support frame would have to be at least 7 or 8" narrower than the face frame opening itself to do it this way. I must have it wrong - this cannot be true, as it would ruin the cabinet for anything, practically, but supporting the sink, and not give much room for accessing plumbing. Does someone know a way that this type of cabinet and this sink can work without the support frame crowding the whole cabinet?
From contributor R:
I had to do much the same as you are referring to. The cabinet was pretty well useless underneath for anything taller than about 12". We couldn't think of any other way to support it. Don't know the exact weight of the sink, but it required two people to lift and set in place, and we were struggling. We had to do a sub-structure underneath so we could sleep at night. I want to say it was limestone? Not much room for the plumber either.
Comment from contributor A:
I have used a 21" h. x 24" deep wall cabinet instead of an apron sink base cabinet. It works out great since the cabinet already comes with a solid top. The only additional work is blocking below to accept toe kick material. Use deco fillers on both sides of the cabinet to finish off the look.