This is from my RP, International Rescue: The Next Phase. Thunderbird 7 is a mobile hospital with a tiny surgical unit. It's a hovercraft, roughly the size of an 18-wheeler, and, if necessary, can split into a control cabin and medical cabin. It also has a separate caterpillar trolley, like the Mole. (My original idea was that it ran on caterpillar treads, but when I redesigned it a bit, I made it a hovercraft, which makes it a little more versatile.) In our RP, it rides in its own pod, like Thunderbird 4.
This particular picture was done in Paint, and I would have preferred to make the edges more rounded. The bubbles on top are skylights, as that's the only way I could create them in Paint. I also have a layout of the interior if anyone is interested.