Proud Food, having looked obsessively into zoning laws in my area, I can offer a couple of things. Zoning-wise, there are several possibilities.
True tiny homes are classified as RVs, so legally can go in an RV park (but many won't allow them).
In my region, a TH cannot go on land unless (a) the land is also owned by the TH owner and (b) the land has a conventional house on it first. Additional rules (who can stay in it, and for how long) may also apply.
Some TH collectives are zoned strata, so basically treated like detached condo units.
I think it was in the one Knaak linked to that had specially-invented zoning, because most municipal bylaws otherwise eliminate all options.
nawhite, yeah, it's one thing to have an option for low-cost in materials...but as you say most many of us there's labour cost or time, and then most places require land underneath or pad rental, which is where cost becomes prohibitive again.