The above idea is good, or you could get some cardboard boxes, cut them to the right dimensions, tape them together and lay them out where the furniture would go (I am better with three dimensions than 2 when it comes to figuring out what works! )

Yes, I agree with Beautiful Abode. One metre (between the back of the seat and the wall or passageway) is required for someone to be seated whilst another can get behind them to access the next seat along. Proportionally, 1.2m x 2.4m is a good proportion for a dining table for 10, which means the person's place at the head of the table will not encroach on the placing of the two diners on either side. Also 1.2 is more generous for serving to the centre of the table. There is no hard and fast rule to dining table dimensions. However, if you table is 1.0m or 1.1m wide, you will need to allow for a little more than 600mm per person in its length. Best way to test the ideal table size for you is to get some table mats and place them on a table as far apart as you feel most comfortable, then ascertain the table size by drawing a line around them.

I would say this is to short. Your bath should be 150 mm from the wall + 75mm standard splash you are at 225mm. The water would land on the edge /rim of your bath. But do not fret. You could install free standing a timber shelf. Above bath for soaps etc and then have the spout mounted onto this? Or just get a new spout?

for a comfortable walking space the island should be about 1200mm - 1500mm away from the long side to the other counters and at least 900mm -1200mm from the end to any other counter or wall then the island could be 600mm deep and 900mm long to fit your cooktop BUT the cooktop on such a small island would not be very safe to use (unless you live alone and have no visitors) and there should be much better options....post a plan of the whole room with measurements and a list of everything you need to fit in the whole room