Thanks Ron!
Regarding the cracks, it probably depends on the size of the panel, how it is mounted and supported, and if there are any odd binding pressures. The material must be treated like glass - if there's a chip in the edge, a crack can run just like it does in glass.
The material I'm using is 1/2", or more correctly, 12mm. I added 1/4" shims to the tops of the cabinet to bring the top up to the same height as the original in order for the stove to fit w/o modifications.
As it's 1/2", I built up the edges to create 1" / 24mm around the perimeter using contrasting material:
We've never needed a large sink in our campers/motorhomes. I put a small pan or bowl in the bottom of the big round sink, fill it with a pint or so of hot water and soap. Then as I wash dishes, I rinse them with a small stream of hot from the faucet, which sometimes runs back into the pan/bowl. My wife takes the rinsed item & drys it, then puts it back where it belongs.
I guess this is due to my sailing days where I learned to conserve water, and the early camping days where we would consume only 5 to 10 gallons of potable water over a week for a family of five. We used local stream or lake water for dish washing and baths.
