Good News Everyone

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 :/.