Are you really going to do concrete because that is massively heavy and the same appearance can be duplicated in quartz?

Lighter and easier to keep clean. Concrete absorbs oils and stains like a sponge.

That is a great point. Haven't really considered other options because we knew we wanted the concrete look.

Will the quartz be similar in price?

do you have Ikea nearby? their Kasker quartz is really lovely, I'm thinking of putting it in my bathroom. it's hard to tell in the photos, but in real life it's quite nice. there are a few different shades of light grey that will mimic the spirit of concrete.

I would think less, but I guess it depends on where you're located. Also, the concrete must be muck thicker than the quartz and have a steel grid concealed inside so it doesn't crack.

You can use concealed brackets to hold it up.

How did you determine 16" for the overhang? That's typically a bit deep.

I've dabbled in making concrete countertops (smaller, but used a mold). were you going to make them on site, in place? going to polish them? (it's a mess)

If you do have it polished, consider adding recycled glass or aggregate to get this type of look.

I have seen slabs of concrete-look quartz at my stone place. I believe this slab was right around 2K

These next pics are Caesarstone raw/rugged concrete slabs. they come in diff finishes/tones

concrete stains something fierce. w/the quartz you get a very similar look, little upkeep.

this one is the Raw

Rugged Concrete, caesarstone

Airy Concrete. (they have a lot more colors now. you should look it up)

this is concrete overlay. it can be done over existing laminate countertops or a similar substrate.

Silestone Eternal quartz in the suede finish. I have this in my kitchen. looks like a smooth cement.

as an idea, what if you did the overhang in a bar top, but used a walnut instead of the cement?

Or, do the entire piece of that side in a walnut, use the cement elsewhere.

this is what I meant for combining both. waterfall the wood on the end, and you can still have your overhang w/o worrying about the weight like you wood the cement.

Thank you all! Great ideas.

We landed on the 16" dimension to give as much space behind the oven cooktop as possible. Also would allow extra room for some stools to sit underneath.

Then I found those 16" brackets online.

I think once I clad the low wall in plywood or OSB and then attach to the cabinets it will help offset the weight. But just not sure if it will be enough!

I would do something with that end post and the same if you add one on the other side, the way you have them nailed together they will twist and warp, they already start to separate.

Plan out the columns and all the moving parts on this island so there are no surprises later on. Simplify this so the countertop guy can install your counters with the minimum number of cuts. Think about how you want to trim everything out so it looks good together.

The solid surface concrete look-alikes far outperform the real thing. Those triangulated brackets will support either.