@elavoie you should build a cardboard fairing for your bike and see how much difference it makes! my bet: a surprising amount!
The dymaxion house was a great idea but a terrible business plan - it depended on mass manufacturing to bring the cost down, but it's obviously gonna be a very niche product, what crazy person wants to live in a circular silver house? (I would, but I am a crazy person, most people are much more conservative) to really succeed most plans need to either work on a small scale, be viable and useful for a small group of dedicated crazies (bootstrapping - "have to start somewhere") and then scale up gradually. OR, make a massive gamble on a huge upfront investment, but of course 9/10 of these fail, so for this plan to work it needs to plausibly offer a return of 100x, at least. If the pitch is "affordable housing for all" I'm not sure if the later strategy is viable, because there is already so much money to be made from the current system of artificially scarce housing.
Maybe there is a middle ground, like, cob house 3d printer? okay that's going too far, maybe just a machine that does the mixing, enabling you to build more quickly? I imagine it would be very satisfying to occupy a house you built using nothing but your own physical labour though!