An island is just a bunch of cabinets in the middle of a room. Decide how big the island will be and divide it up into individual units. Just look at the two cabinets you have for construction details.
What else would you need?
Ron

You also might consider a rolling island. The downside is that if you want an island and it is required by code to have receptacles , then it would have to be fixed.

Since we will have a slide in range, how would the cabinets on both sides of it attach as well as the back panel? It seems the cabinets would need to be secured to something other than the counter top.

A kitchen island composed of only a 9" cabinet, a 30" range" and a 12" cabinet is a HUGE safety hazard, and in most locations, against code. Basic safety concerns dictate that any cooking device have 12" of cabinetry on one side and 15" on the other and at least 12" of space behind it in an island configuration. If you don't have at least that minimum, then rethink your design. Even the minimum required space isn't enough IMHO in actuality of real cooking. And then there's the ventilation to deal with which greatly complicates things and increases the price exponentially.

This isn't something you want to go forward with if you ever have ANY additional people in your home in your kitchen. And, if you ever go to sell, you're likely to be forced to correct it as well. Go to the kitchen forum and post your layout and ask for some help.

Never heard of any cooking device in an island for the reasons stated above. I have seen warming drawers.

STOP! This doesn't sound like a good idea.

It's too small.

How will you vent the cooktop?

Do you have 40" between the existing counters and this island?

Can you open the oven door into this 'aisle'? Is it directly opposite another drawer or appliance that opens?

Get thee to the Kitchen forum before you proceed! LOL

Okay, a little more info on my part, the range is a downdraft Jenn Air, we have 40" between all counters and the range isn't opposite another drawer or appliance. The counter top will extend 10" behind the island. Whew! We did find an article addressing our island issue by "Ask the Builder" but I will seek out the Kitchen forum as well.

You might run this by your building dept and get what is code in your areas,clearance requirements , etc rather than solely relying on any forum.

Whew! That sounds better. I take it you don't plan any breakfast bar near the cooktop; ten inches is too little to be safe -- and there would be no knee room.

I have/had islands in most of my kitchens. My present kitchen has an island, new, with a 30" induction cooktop and 21" cabinets on each side. It replaced a 36" cooktop with 24" cabinets on each side, which was too large for the space (only a few fridges would fit so that there was room for the door to open without hitting the side of the island). On the first island, the overhang on the counter was 12". That was minimum. Our present island has a 15" overhang. Much better.

We had a downdraft vent on the first island and a gas cooktop. I rarely used the downdraft and it took up so much room that I don't have one now and, so far, no problem. The kitchen is large and has 9' ceiling. I much prefer the smaller island with deeper eating counter. I think 9" and 12" on each side of a range would be way too small.