They're mine. Yes, Dehate had them first in 16" for his MK3 and after talking him and the owner of CCW they agreed to build a second set for me. Mine are 18x8.5 et38 in the front and 18x9.5 et44 in the rear. With tires mounted you're looking at about 28lbs a corner. I've been driving it for the last 3 weeks both taking it easy and pushing it a bit and have to say there's no brake performance issues at all. The shop that built the car, Phantom Autowerke, is going to route some ventilation ducts under the car and behind the front bumper as an added precaution.
While these wheels seem to be a love 'em or hate 'em type of design, I personally couldn't be happier with them - in person the only word I can think of to describe them is stunning.
Happy to answer any other questions! If you have a chance check out my build thread to see some other work put in on the car.
PS - They're way more than $300/wheel.