First can you fix your layout?
36" aisles are way too narrow. Minimum is 42" between whatever sticks out the furthest. They are not measured from cabinet to cabinet because even if no handles, etc stick out, you still have countertops that stick out 1 1/2" on either side. So your 36" aisle between sink and island is really only 33" wide.
Similarly if your aisle between back wall with the stove is 42", you have to account for the stove handle as well as the countertop on the island side.
Additionally seating at an island requires 24" width for each butt so to get 4 stools at the island you'd need 8' not 7.
Also as LH mentioned a prep sink on the island would be a big help. We tend to take food out of the pantry/fridge zone, move it to the sink to to rinse zone, then bring it next to the sink between sink and stove to prep zone, before moving it to the stove to cook zone.
And along with what I said, you don't want your dishwasher in your prep zone. Meaning the dishwasher should be to the right of the sink.
Ideally you don't want to cross zones, nor do you want any two appliances more than 9' from one another.
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butcher block end
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