Nice, but I reckon I could do rather more with that idea.
First thing is that in his design the centre of gravity shifts back as he leans back. That's upsetting the balance on the base board. I'd build it with an alt axis just like that on the big dobs so the chair reclines by rotating around an axis where your centre of gravity is, although a handbrake or clamp is clearly desirable in some circumstances. Teflon and ebony star should be ideal just as it is on the dobs.
Thinking back to the wheelchair 'scope I made for Andrew James some years ago, it was quite straightforward to cantilever a 4" SCT on his wheelchair and it was surprisingly easy to use. With a chair like this it should be straightforward to do likewise with an SCT up to about 8" aperture, or a short focus refractor up to about an 80 or 100mm, say f/6 maybe f/7.
Need an armrest with built-in eyepiece holders, cupholder; add Argo Navis and mount the display as a heads-up beside the eyepiece ... it has real possibilities.
Add a laser pointer and it could be mistaken for some weird piece of optical gunnery. Incoming at two o'clock !!!
I'm sure it was designed to be relatively cheap - hence the moving centre of gravity and relatively few moving parts. The arm/mount for the binoculars is quite clever.
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