Round houses have been used in Britain and in many other cultures across the globe.
Radiant floor heating - and everything else you need to know about heating systems
Thermal Mass Rocket Stoves on our Minds... Midwest Permaculture
flexible dome connectors by EFFALO - Thingiverse
Holy moly! I would have never thought to use PVC for something like this. (Free plans and pictures of PVC pipe projects.)
The Wrench Breaker
And that's how the Japanese do it. Wood working!