Your layout is actually very similar to what I just did in my kitchen, with my island being smaller -- at about 4x7ft, and the space accordingly smaller. Works great for me, and I like your space! Moving the DW to the right of the sink is important, I agree. Another thought. I'd consider pushing your cleanup sink down the wall towards the right instead of centering it. When you design your cabinetry, you can center something lovely if you want a focal point there under what I am guessing is a window arch of some sort? (Maybe some special cabinetry stuff -- like a baking center . . .) Pushing that sink (and DW) down that wall will open up more nice prep/baking/etc space on that main wall and provide sink access closer to that entire right half of the kitchen. My sinks and cook top are laid out just about exactly as yours are now (except the DW on the right), and I generally use the island sink for cooktop water, etc. Only down side is that if you're making a mess by the cooktop, you do have to drag all those sloppy onion peels, etc either across the aisle to the island or a ways down the counter. Works OK for me, but something to consider. IMHO, your "work triangle" that is drawn should include the prep sink instead of the clean up sink . .. so, your work triangle is actually quite compact, so I wouldn't worry that the clean up sink moving right would make it too long/big. Depending on what that arch feature is on that sink/DW wall . . . have you considered swapping the sink and cooktop locations? The sink could be under a window looking out to the screen porch (and beyond), and the cooktop could be the focal point on that big wall. It might be nice to have the cooktop further away from your fridge (if it's as busy as mine is! My fridge is in a different location than yours, so that's not an issue for me.) If you did that, you could move the prep sink to the back right corner of the island instead of the back left.

Just a couple of suggestions: I am attaching a reveal that has a similar cabinet to the counter but they used bifold doors (4th and 5th photos) It is more versatile for storing taller appliances (Vitamix, stand mixer) and allows you to use the interior countertop. Since you don't have a lot of counter between the sink and range, I would use a ledge sink that holds a cutting board to expand your prep space. I would also go deeper on the pantry cabinets if possible. I had a 12" deep pantry in our old kitchen. It was great for cereal boxes and cake mixes but not for cans. If I needed something in the rear, everything had to be moved out of the way. Extra depth would allow you to install some pullouts or if using shelves, extra space to stagger cans so you can see labels easier. kitchen-reveal

What is the existing is the bigger question. Does that bump out exist? Where are the water and vent locations currently? Anytime you’re proposing a 100K+ project like this, you need professional design help. Because you’re not getting your money’s worth out of the changes as pictured. The hutch seems to be purposeless and just there to occupy space. It’s not close enough to either table space to provide dish storage, or a small appliance breakfast station. The family’s entry is awkward and doesn’t give you that needed transition. The public entry is questionable as well.

Blind Corner against your exterior wall, bump your range away from the cornner a bit and 2 or 3 drawer bases on either side. Fridge cab 3" off of the hallway wall, coffee nook next to it. Apartment dishwasher 18" width, 27" sink. Drawers add valuable space. Toe kick drawers can add more. Could switch to a micro induction top and a table top airfryer/oven combo if you wanted more space. I have a large kitchen and use my air fryer for most baking