How about butcher block instead? IKEA and the big box stores sell it for countertops, the price is decent, and you won't have as many issues with buckling, water damage, or what to do with the edge as you would with the ply. If the edges of the ply get wet, or if any seam around a sink gets wet, the plywood will "blow" and you will have to replace it all, anyway.

If you mean a seam? Maximum length they can make a piece without a seam is determined by the length of the slab available.

Hi, we have an unusual space where the bottom cupboards are actually head space for a stairway downstair. We are running the bench (700wide) over this along the wall (the glass door is being replace by wall) and looking at an on bench panty system. Has anyone used the Hettich Vertico mono system in a large 1200 wide 700m high (maximum extent) installation? We would have all the appliances behind it and potentially lit glass display shelving on the top 700 to the ceiling. I'm just curious as have only seen this in small appliance cupboard type installations to date. thanks

I'm thinking this discussion could help you! https://www.houzz.com.au/discussions/concrete-bench-top-what-are-your-thoughts-dsvw-vd~3228715