If you've been to a Tesla Store, then you've probably seen the rolling chassis or "skateboard" on display with its various gadgets up in the nose. Actually, there's a little more to it than what you saw. Here's a walk-through, beginning at the top of the image... 1. At the very top, the grey ribbed area is part of the battery pack, a taller part than the rest of it, containing the brains of the battery. 2. Just below that, centered, is the air conditioning compressor. 3. Below that is the power steering unit, with the steering rack behind it. Note the steering shaft angling off to the right. 4. Next are two coolant pumps on the far left and far right. I believe both are used for the battery pack. 5. Below the pumps, from left to right, are the suspension compressor, water heating/cooling unit, and the ABS system.