with a lot of helpers crowding around to help i suggest that the new kitchen needs to be zoned for tasks and be open plan without a separate pantry...this rough idea has a central island about 2m x 3m surrounding the column and walkways approx 1.5 m between counters, subject to available space with the column the island has mostly underbench drawers for pantry food storage, crockery and cutlery and the counter is for food preparation, serving, sorting and distributing clean and dirty cookware and bags of groceries etc and has a small extra sink but no more than a couple of stools to keep the workers moving!!..Subject to suitable access the central space under the big island (would be about 60cms wide, 90cm tall and almost 3m long!) would be ideal to store folding tables and chairs and "christmas" supplie in wheeled storage crates or pull out kitchen island trolley..There's a full size fridge and freezer as well as an underbench drawer fridge next to the tea, coffee & toast area,with cup glasses and breakfast supplies in the overhead cabinets..twin dishwashers with double sinks, hot cold water dispensers, pull out garbage bins and a modern insinkerator or compost disposal in the sink area..the cooktop and food prep area is on both sides of the corner with big appliances underneath, and serving plates and casserole dishes etc overhead..The base cabinets should be deeper than normal for more generous counters and giant cooking equipment and appliances stored underneath and to have shallow splashback shelves for herbs,oils, sauces etc and there's a stacked wall oven and microwave and a stacked wall oven with warming drawer and vertical shelves above the ovens to stand up trays, racks, cake and pizza trays and drawers below the ovens for saucepans and baking dishes...decorative finishes and fine details need to be determined by the resident cook for personal taste and everyday comfort

This is an Australian site, we work in centimetres. So 30" is 66cm,and 36" is 90cm. Assuming the oven is on the 18ft side, then I would definitely go 36". Do you get a 24" oven or 60cm oven where you are? You could install two 24" ovens. Then you only need to heat up a small oven for everyday use, and you have the option to run both ovens when cooking for a crowd. All the best.

I understand the beam being installed when you did your earlier extension as that was an external wall, that's why I have suggested keeping part of the wall next to the island which was also an external wall, to support this, I will check this in the drawing to ensure it lines up for you. By opening up this wall as much as possible you are allowing more light back into the house The cost of running plumbing across I think is negative/comparable to moving the plumbing for the re positioned laundry and kitchen and removing any load bearing walls. Storage in the new kitchen is a big 2900 x 900 island of drawers for easy access, I have added a wall oven but that could become a 600 pantry with drawers in the lower part with a shelf above for small appliances. The wall with the TV could be a wall of narrow built in storage to be used in any way you need. This floor plan gives better flow between kitchen/family.dining/alfresco and better for unloading the car with the driveway running down beside the kitchen and verandah

Consider whether you need task lighting on the island bench. If you are using pendants they only have a limited space to be installed and only room for two- does this work for how you want to use the bench eg for food prep? The skylight will be a real feature during the day but not so much during the night. Another idea might be lights or pendants over the island and the skylight in the space between the dining and kitchen.