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Yeah it's the IKEA Lillangen. It's not a custom base though, just the standard white unit. My motto is "if you can't go bespoke go basic", hence also white 15cm tiles and grey vinyl floor.
Having the tap on the side is the trick for a usable slim sink (albeit a bit crap for left handers). We are doing the same thing to fit a sink in our new utility (which sounds a lot bigger than it is..really a corridor with pretensions)
Like this.
I spent about 6 months measuring the bathroom in every hotel I stayed in to get an idea of how much space we'd need.