Hi. I have applied for a Home based kitchen licence. Based on the photographs, the city council people have told me that it would need an extra sink for handwashing.
Please stop reading if you don't like to guess things because I am asking you to guess what they city planner may approve.
This diagram explains my kitchen.
Your proposed tub is OK but I expect might be too big. You need dedicated handwash facilities within 5m of the work zone. A small basin is enough. Or stipulate that one of your existing sinks will be for handwash exclusively.