These guys are claiming that gyrocontrolled inflatable modules that allready exist (well, without the gyrocontrols then) could be stacked onto each other initially up to 15 km high. If placed on a mountain that could get it up to 20 km.
This could then be used for tourism, atmospheric research, telecoms or spacecraft launches.
Eventually the Canadian team thinks it could go up to 200 km, low earth orbit.
I’m all for it!