Hello
The dimensions either side of the kitchen island are what one would expect but should not really be less . The plan is a very sensible layout on both floor levels at light is being brought in at the right points and to the right areas.
The only comment I have is more to do with the furniture arrangement at ground floor next to the bi-folding windows and one should allow more space around the end of the island
But this is not the end of the world as one could simply only have 2 chairs instead of 3.
The other option and more intrusive solution would be to shorten the island by 450mm to create the clearance to suit the furniture layout.
Given that there is an extensive lounge in the new basement I would sensibly say that the first proposal noted above of updating the drawn furniture layout to create the necessary circulation around the end of the kitchen island should resolve the issue.
It is a very well thought out and clear design and I think you will be extremely pleased with it when it's completed.
Q