So I understand correctly you want to take a piece of land and develop it with mhp infrastructure (water, power, sewer and roads) then build tiny homes to sell to tenants who will then pay you lot space rent for the home. 

If you're established enough as an investor that you're already doing projects and own assets, it's highly likely that taking the time to save 10 cents per letter by doing it yourself is not worth your time.

Timeframe, legal considerations, and best practices going forward of course vary by jurisdiction.You can't count on believing that the family member doesn't already have utilities under their name or similar arrangement that will keep the power on for them.

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Additionally, you can rent it out for a minimum of 3 months (high season in Florida), 2x per year which is very investor friendly.

I'm in the Pacific Northwest where home prices are quite high.

In tax sale despite the positive hype of high interest and low risk there is significant risk in tax sale.

Study names Columbus as the fastest growing city in the U.S.I'm kicking myself for not taking the plunge two years ago, back then I thought 4.5% was high!

Also, there seems to be high risk of tornadoes/high winds - looked around for data.

After experiencing different types of inspections with all kinds of properties from custom builds to existing, it all depends on your end goal , I highly suggest you reach out to a team, really strong team such as @Jorge Vazquez.