Passenger Carrying Telescopes

Is anyone aware of any portable telescopes that have been built where the observer is carried on the telescope's structure? I have an idea for a Newtonian of about 30" aperture that would include an observer's chair, eliminating the need for a ladder. I believe that this could be done without introducing excessive vibration from the observer's body.

I have built a binocular chair, and noticed the same as some others have mentioned that have built them... the vibration from your heartbeat is apparent at the eyepiece! It's true. The weight of a large scope may behave differently - I don't know.