I don't know if this was the best way to support a fireclay sink, or if this installation will work in a corner cabinet, but here's what my contractor did.....
{{gwi:1586006}}

It has been installed for a couple years now and hasn't fallen thru yet...so that's a good sign! FWIW, my sink is from Whitehaus model 501---something like 27" wide if I recall correctly. (and it IS a farmhouse style sink, I just didn't have it installed with the apron front showing)

-Thanks for the photo klb. I'll show it to my GC when we meet again.

My installer built a frame with 1x1" pieces of wood to support the sink. My

has a bottom above the doors, which, obviously, had to be cut for the drain/disposal/water pipes. They built the support frame above that, so nothing shows. They cut the front out of the cabinet. Then they set the , and when everything was done, they scribed the trim and attached it to the cabinet.