DH really wants a cast iron sink...the Braxton Bragg HUSH video states clearly that it is good for stainless and vanity ceramic...from that positive statement I think they mean it was not intended for a cast iron kitchen sink which will weigh much more. Kohler's instruction tell you to build a wood frame...DH would do that but to me something like the vance undermounter, which is adjustable, makes more sense BUT neither of them seem to allow for replacement of the sink without destroying the countertop should that become necessary. How can they be installed with a view towards possible deinstallation? Can they be removed without destroying the counter top?