Hi Nik
I like the product idea. Wouldn’t it be a much better idea to use a front surface entirely in wood, mated with marble on the back?
Hi, Ralph!
Thanks for the feedback! I had thought about splitting the back surface with different materials, but the UX didn’t feel great. Imagine you were cooking and you used one side to cut your meat, but then you needed to flip it to utilize the other material. Besides stopping what you were doing and washing it you’d have to place the dirty side down on the counter making a mess.
" 1. This board doesn’t separate the ingredients"
By pulling the pieces away/apart from each other I think it does meet that requirement.
" 2. The board will be inconvenient to pick up due to the weight of marble while it communicates an even distribution of weight."
I felt that weight wasn’t a huge concern, the board at most travels from a kitchen cabinet to the counter-top, although if you were also using it to serve food the weight would become an issue.
“5. You can heat up the marble and use it as a hot plate on the table, the wood serving as isolator”
Interesting idea I had not thought about that application!! 
Thanks for the feedback!!