I put a lot of thought into what kind of sink to install ino my new kitchen: single vs double, stainless steel vs other materials, dish drainer or not, and finally undermount vs top mount. I went safe and chose industrial grade steinless steel, double sink without a drainer but with aditional part with multi purpose. I was very indecisive about the last thing: undermount vs top mount sink and finally decided after reading this - I will go top mount.

take this photo to second hand furniture/kitchen stores and contact P&O

Early Settler has fireclay ones for around $1000.

Congrats on doing the planning and thinking about how you will use the space, absolutely essential even if you don't do a lot of cooking. A well planned, functional kitchen will make your life easier and add value to your home. I am an avid cook and long time renovator so have done many kitchens in my time. Looking at your space and how I personally use a kitchen I'd suggest two sinks. A small prep sink on the stove side and a large double bowl sink on the island, with dishwasher underneath. I think your hotplates are in the right location as long as you have at least a 500mm or more of bench on the wall oven side and then ideally approx 2m (if you have it) from the hotplates to your prep sink. This divides your kitchen into zones, prep, cook on the back wall and clean up, serve on the front. If you tried to put everything on the back wall it would be too crowded and not work. Think about a desidng that allows for two people at all times to be in the kitchen, you do this by dividing your kitchen into zones. Prep, serve, clean up and think about how you entertain or liaise with the family whilst you are in the space. I hope this helps and best of luck with your new kitchen.