Looks like you have several things to consider in the layout. What the view out the window ? Do you really want to see more of whats outside? Cooking is always best on the outside wall to get it vented, island cooking is a last resort, downdraft dont work well at all and the island hood is typically obstructive. Looks like the wall should come out to open the space up. Best advice is to have a designer come to your home and see it in person. There are costs associated with every change and it is very difficult to judge just from photos.The design phase is the most important part of any kitchen remodel the builder is only going to install it as the plans layout. Find a great designer that makes house calls :)

as a mum I agree worktop is priority, but also there's extreemly little cupboard storage so I would stick with the pantry cupboard and add a freestanding ikea Varde unit like attached pic ( I would have preferred integrated dishwasher too and a bit of moulding/ shape to the door style in a perfect world ) where's the fridge supposed to go?

SPACE TOWER pantry; flexible access, flexible storage & flexible design. Ergonomic and efficient the SPACE TOWER speaks volumes in kitchens large or small. Organise your pantry with AMBIA-LINE or ORGA-LINE inner dividing systems by Blum.

Yes, for that size I would look somewhere like Southern Hospitality who supply restaurants etc, https://www.southernhospitality.co.nz/categories/storage-shelving/bulk-containers.html or Stowers who supply plastic bins to may food industries: http://www.plastic.co.nz/plastic-products/pd-square_rectangularpails.html Check that the seal on the lids is suitable for long term storage, as you may have a slower turnover than restaurants would. Be aware that slides for pullouts carrying that sort of weight will be expensive. Another option is a floor level cupboard with bins on wheels for the very large and heavy items.