Not clear how to invest there, but mentioning it here FYI. There maybe a way to get in at the pre IPO stage, see
Partner – Boxabl.
Background: new housing construction is way too inefficient.
Elon Musk now lives (test lives?) in a Boxabl Casita Tiny house rented from SpaceX. Considering the huge amount of new housing needed in Boca Chica/ Austin - and this seems to align with Tesla's mission too, as well as the longer term Mars SpaceX mission. Talent (great engineers) and batteries (for the integrated HVAC /solar systems) are probably not an issue. Batteries as CATL non high end car batteries seem to be ramping up nicely.