Kitchen Island spacing

Hi, I'm hoping to get some advice on whether there is room for an island in our family's kitchen design. Semi d house.

The plan is to knock the dividing wall wall between our dining room and kitchen and a small extension to take in our patio. This will square off the space and give us a 6 metre long by 5.2 metre wide space to place with give or take 100mm for new insulation on the external wall behind the new kitchen units.

I'm wondering if it's too tight to have an island parallel with the units and then dining table. So say 60cm units, 1.1 metre gap to island, 1 metre wide island would be 2.7 metres. Would our 90cm wide dining table be too cramped in the remaining 2.5 metre space? If we had the table fairly close to the wall with just room for a bench, the space between the island and the table and chairs would be about 90cm. Im thinking it might be too tight even without stools at the island . Could get a narrower island if needs be. Length of the island would be about 2.5m. Room would have large sliding door out to the garden and a single wall of cabinets.

Alternative might be to not do the big sliding door at the back and have a peninsula from the back wall parallel to the main run of units running for about 2.5 m. Doing it this way would maybe give us more space for the dining table perpendicular to the units.

Thanks in advance