Hello Kristine - I am just seeing your question. A year later and the walnut cutting board is still great. For logistics. The island has a wood support right where the marble and wood meet and also around the center of the board and of course the perimeter. So, when designing the island, the supports had to be added to the design.
For installation, it was easy. I just had the marble cut short and they installed it. For the board, make sure the stone side is not finished as it needs to be a straight edge to butt up against the stone) The board is attached using L brackets I think every few inches on the perimeter and few around the center. It took a bit of work to make sure the board snugged right up to the marble when screwing it in, but it is totally fine.
I initially thought I would need to add a bead of silicone, but never did. A year later and it looks the same as the day we put it in. It isn't a crumb catcher where the two edges meet, but I am not too messy. I can imagine it might be a drip problem if I was slaughtering hogs on it or something....
Q
