Actually, the coffeemaker, a "pad-type" one-cup device, sticks out a little bit through the "screen" of the iMac so you can grab the cup. (The screen can be printed with any picture you want.) The mini is a stock machine but connected to what remains of the iMac so that its optical drive is behind the slot where the iMac's CD drive would be, its ports are accessible where the iMac ports used to be, and it turns on with the iMac's power button. And the subwoofer is a JBL Spot.
Diebel doesn't sell the iMac CS off the shelf. He makes them to order, using an iMac and a Mac mini you supply. Depending on "version, color, setup, and more," labor and materials cost for your CS will run
300-400 800-1,000 Euros (today, about $1,150-1,440). [Correction from Mr. Diebel.] For another 30 Euros (plus cost of the machine), he'll find you an old iMac on eBay.