@poppadave
The sink next to the octagon I used several plug-ins, Curvi-loft, round corner. The ones to the right I used the native tools. I created a basic outline, copied that down on the blue axis, created a plane at 40 degrees, moved the front two corners back and in until they were intersecting with the plane and the edges. I hand stitched the top and bottom corners together. Made a group, made a copy, scaled one of the copies down by .9, dropped it in the center of the larger one, exploded them both, and deleted the face. I made a rim for the sink using "follow me". Scaled it up by 1000, and intersected.
I'm sorry, I'm not the best explainer and I sure can't make you a gif. So I hope that was enough information to head you in the right direction.
Good luck,
Chris
HP Sink.skp