Shelves help make best use of the space. Be sure that they are sturdy - the shelf with the fermenters is very heavily attached to the wall and I believe I sat on it for a while before I tried loading it up with carboys full of water, which I did for a week or two before I'd trust it to beer - mistakes are messy and expensive.
White walls, tiled floor, brew supervisor at lower left.
Yes, that is percarbonate in primary, air, air, air. Bottled 10 gallons, gotta brew more, had no time to brew and fill the other secondaries as planned for the continuous rotation scheme. The clear bottles are mead.