@Joe Splitrock -
1) It seems that you have already made your decisions about it. How about surveying your target market? Those people are who you would be building them for, selling or renting them to. It makes no difference what anyone thinks except them and if your #s turn out where YOU want them.
2) There are even different investor viewpoints about #s and where an investor wants them to be. If it works for you #wise and there IS a market for a community, then go for it and don't worry what anyone says. If you just really love tiny homes and thus you would love everyone else to have one and the #s really don't work out, then do something else in the meantime and come back to it when the #s and the public for it are there.
3) I will say that I prefer purchasing 3bd 2 ba SFRs as they rent the best in all my markets. It allows for a less narrow market. Too big gets too trashed and thus lots of expenses. Too small usually will have more move outs. I researched it and found that to be true FOR ME. It may be different in other parts of the US.
4) It sounds like you live in a tiny house and that you may know that community well and know what they like and where they will live. If you don't, best to find out before you put up time and money in it and find out it isn't want you had hoped or wished for others. I have done a project that cost me time and money and due to not surveying my target market was surprised they were not interested in what I thought they would be.
Hope this helps.