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Bit late to this one but check out the mitred join on those boards, that's how they get the grain to look right in the corners. It's tricky to cut the mitre at 90 degrees to the edge of the board and at 45 degrees. Then you have to join them with small biscuit joints. I do them with 4mm domino joints because that machine is specially set up to cope with long mitred joints.
It's a small detail but it adds a need for accuracy to the project. You're also hanging quite a bit of weight off the wall so you need strong fixings and remember that some people like to sit in the sink if there's no bidet!
I might give knocking something like this up actually... fill the sink end of the bathroom with a made to fit vanity unit - which uses the walls instead of sides, so kinda two shelves with a couple of connecting uprights. Thinking of gluing together two thinner boards as I dont have a special saw to cut channels. Crazy talk?
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