Well... First of all CineSlide™ is a trademarked name for one device. Sometimes I'm flattered that the name is used to describe all things that move lenses, but make no mistake, there is only one CineSlide™, and it does not go up and down. We'd be grateful if any non-CineSlides are not called same. It would be almost like calling a HTB prism lens a Cinedigitar.
Second, the stand in your photograph is just the tabletop base for a Multistand II. I can get you longer posts for it if you like, we make them all the time. They aren't cheap due to the polish and materials we use, but if you want longer posts, contact me off-line.
That said, you would have to reposition your lens each time, I suppose you could make a "stop" so it came to rest in the same place each time. And, I'd strongly recommend using some of Isco's baseplate holes to bolt it down, because it will be top heavy up that high.
As for breathing ports, I've only encountered one unit with dual exhaust on the front, the new JVC. But only one side really puts out any air. The lens in no way blocks the exhaust ports air flow. The real CineSlide is configurable to "home" on either side in case you worry about it. Further, because of ample yaw adjustability in the lens mount, it can be mounted as much as 15 degrees (more by special order) off axis with the light beam so that as the lens moves out of the light path, it also moves away from the projector. But that's never been necessary.