Some syndicators have so many fees (acquisition, construction management, asset management, capital event, disposition) the syndicator is going to get rich even if the deal produces zero return for its investors.

Does anyone have experience working with "Nailed It" construction company?

No one is going to allow that and construction-wise, it is usually not cost-feasible for the output rent on such a large property.

(I personally did this) I would say though that in the worst-case scenarios that you mention of loss of job and such, I view it as more helpful to have someone by your side helping you construct a plan through it who has been through hundreds of those situations before helping clients.

For example, you can buy 5 new construction homes at great price points in my market that would be perfect for this strategy.

.- Texas vs California Home Construction.

I work with a handful of clients each year on the acquisition and construction side and help them make an enormous amount of wealth on top of managing their properties here in NJ. 

They’re often motivated to sell before construction begins due to noise, traffic, or potential rezoning.

Will getting this second home loan right now, affect me negatively when I go apply for the construction loan in the next 1-6 months?

In my market of Oklahoma City, you can buy new construction under $250k in good school districts.