what happened to the old column? i think you need to add a corner cabinet (900 on the stove wall and 1050 on the sink wall) with doors hinged across the corner provides 300 + 450 wide doors and better access to the corner for storage of big appliances and to allow more space for the drawers to open, the 1000 fridge space allows an air gap and two 750 wide drawers next to the 900 wide stove, i've kept the 1200 gap between benches and island and added a cabinet (opening toward the sink allows for a 600 wide 450 deep space for a bin) then two 750 wide drawers and the built in microwave making a longer island and extra drawers next to the dishwasher ...in my experience, if you're having custom made cabinets you only need to specify the size of appliances and sink, the general layout of the room and your preferred arrangements and approximate sizes and the cabinet maker should measure the site and custom make the cabinets to suit the space with minor alteration to allow for any obstacles eg like making the pantry cabinets narrower to allow for architraves around the entry door..and it's more comfortable to walk around if the pantry doesn't overlap the architrave or encroach on the doorway

i would probably try for at least 90cm but depends on the size and shape of the room, location of doors and windows and size and shape of other fixtures..can you post a plan of the room?

2500 x 900 or the 1000. Aim for 1100 - 1200 between benches.

you want the pegs above the head of the largest person sitting on the bench so they don't hurt themselves. They also need to be high enough for your longest coat. Test it out.