Off topic, they look like detached homes. Was there a conscious choice not to make duplexes, quads, or an apartment building? Tiny homes are just so weird to me... People will really do anything except stick units next to each other

I get that he enjoys staying involved with the project including providing/helping services for the community, but this probably doesn't need to use the "30% of income rent" crutch that is typical. Would be less time consuming to sell homes at cost, perhaps partner with bank to guarantee mortgages at low rates, let the community be a self managed HOA. Can make unlimited communities that way instead of tying up all your/his time into this one.

Are these houses good shelters for tornados?

They don't look like they would be. That alone kills the tiny house for a huge chunk of the US :/.