Are you sure about only having a 600mm cooktop and rangehood? Thats my only other comment.
I have a large island bench and will have the sink to one end,
Am starting to think I might make the appliance hutches wider (say 600 each) and change the cupboard underneath to drawers (making them wider as well). My sister mentioned a door to a cupboard that you open up and then push down the inside of the cupboard on one side. That might be a good compromise between the rolladoor and narrow bifolds. Will have a play around tonight ....
Looking at getting a 750-800 cooktop. Oven will be 600. I'm happy enough if the rangehood is still 600. We don't tend to use the rangehood much anyway.
Do you think we should have downlights in the bulkhead pointing down to the bench on either side of the stove?