Evan Davis Ceramics recommends that you acquire your basin or sink before first, before you design or build your bathroom vanity.
Why ?. Simple.
Your new basin or sink will be the focus of your bathroom design. The design of your bathroom vanity will be dependent upon which basin or sink you choose.
The colour, style, diameter and height of your basin will determine the colour, style, depth and height of your new bathroom vanity. Any potential errors in design will be mitigated if your basin or sink can be seen by your by your self or your cabinet maker or builder. You will also need to physically seen by you when you are choosing colour scheme of walls and tiles.
Lastly. We might have exactly the basin design and colour you want in a basin that is 42 cm in dimater, but you have designed the bathroom vanity for a slighty smaller basin or larger basin. The problem would not have arisen if you had first taken delivery of your new bathroom sink.
Have a look at some of the many great websites offering custom made vanities of high quality. www.australiantimberslabs.com.auThere exists a multitude of options. Wall mounted brackets. Convert an old side board or dressing table etc.