One autonomous-ish glider made of bamboo and stuff like that, several very large balloons, a lot of hydrogen and a pressure suit.
Firstly some kind of low-cost and preferably a bit green way to produce hydrogen.
Balloons inflated with hydrogen, lofts self to say 60,000 ft, with the glider before
I forget to mention it.
Gas release valves are ...well, released, balloons deflate, then are reeled into onboard storage boxes in the glider. Thinking something like mangles covered with bubble wrap to expel as much hydrogen as possible.
Glider then autonomously glides to next hydrogen refilling station..
Many wrinkles to work out, like
1) what is the likely range
2) is it less stress on the glider if it's hoiked aloft pointing vertically
3) is it possible that not very useful land en route could be sprayed black to give a thermal boost on the way etc etc..
4)Can the balloons be re-used
4b)What about duty-frees, do I have to push the trolley myself?
Could be used for neo-space tourism, alternative to a Lear jet, or just getting my butt back from Thailand to Japan.