view of kitchen (windows will be casement)

How will you vent the cooktop? If you do much cooking at all, you really should vent to the outside.

I'm not sure what the recommendation is, but I know you want a LOT of space between cooktop and island seating.

What's your plan for the 12" base cabinet in the middle of the bottom wall on your layout? A cabinet 12" wide and 24" deep can be hard to use.

Would you rather work with your back to your family looking out the window, or would you rather work facing in towards your family. Prep is 70% of your time spent in a kitchen and cooking is only 10%. Right now, your island isn't big enough and lacks water to be able to serve as a successful prep station, so you will spend your time with your back to everyone. If you do want to face the room and not the window, the cooktop needs to come off of the island and go on the perimeter.

Our kitchen plan is somewhat similar, but our cooktop and sink are swapped. I would not want a cooktop on an island that has seating for safety reasons.

Just a thought!