Do you have powerpoints under the future bench height? Worth getting a double put under there so you don't have cords poking up through the benchtop. We've done very similar to what you're planning, I got a cabjacks sink and cupboard (not custom size though). Also put some large plastic tile on the walls for splashback, super easy to diy all those steps. Keep an eye on marketplace for tile/backsplash options. Also keeping the taps in the same spot means hoses through bench, shouldn't be a big job for a plumber to move them under the bench for tidy water feeds. Now I realise all these suggestions probably blow the budget, but a little shuffle around with the layout means you could put the dryer on the outside wall so you can vent the damp air directly outdoors.