The pros will ask you to confirm all measurements. I'm going to go out on a limb and say you do not have enough room for an island, let alone one that sits 4, especially not if your kitchen also must fit a 6-person dining table.

I’ve responded twice already, and my posts have disappeared!

You don't have room for an island in that plan, and the kitchen is scrunched up to a corner of the room. I would get rid of the door/deck, move it to the living room, or to the short wall. In the plan I show a bench seat built in to the island. There’s an image below that gives you an idea of what it would look like.

You do not have space for an island with seating on the long side. If you use standard base cabinets, you could have 12" deep cabinets on the back, plus an inch overhang on each side, so 38" x 7'. You could have one seat on the short side, for a perch if someone is in the kitchen with you. 5.5'-6', depending on how far you want the seat to protrude into the walkway. Two seating areas back-to-back (table and island) would need 60", and your space includes traffic path to the sliders. There's space for a prep sink on either length, since what should be the prep space in the corner has been bombed by the pantry.

If you kept the table pushed against the wall all the time, it might be doable.

Mock it up on quad paper. Leave 42" between island and countertops/cabinets.