As cool as these are, they aren't practical.
They really aren't, water changes must be a nightmare, not to mention filtration.
Yeah. You would have to haul the water all the way from the sink.
A friend of mine has a coffee table aquarium. Its pretty cool to look down into the tank, gives you a completely different perspective.
Just pull the plug when you do a water change
Looking at that I would make it so the top can come off somehow otherwise it would be really hard to keep it looking good.
Make the sink, and walls stay in place, and just have the top plate/cover lift off.
Here ya go, it's only $4,500.00 and free shipping.
Aquarium Sink - Opulentitems.com
They have coffee tables also