You could easily get 75-80% LTC on the cabin build meaning you'd need about $200,000-$250,000 CASH, to complete the project.Take 200k out of the FL house, build, rent, refi & payoff the FL property again would be my best bet about going about it.

You will need to factor in rehab costs, which could easily eat up another $50-75k depending on the condition.

Additionally, make sure you’re familiar with local property laws and any regulations that could impact your investment.I agree with @Jason Wray that you can easily find a cash flowing deal under 200k. 

Typically these switches are in the vicinity of the furnace and not easily mistakenly switched off.  

Is there any way to easily find out what areas around detroit are what class?

I could very easily rent the property again but my plan was to sell it and use that cash for the next investment.  

You could easily buy land that is zoned for multi-family and find a lot where you could build 4-8 townhomes.

They may easily discover the clubs, investors/end buyers themselves and just sell their property to a highest bidder without sharing proceeds with a wholesaler.

But the above statement is easily used generically for any market. 

It can easily take 6+ months to find a motivated seller. - Just be prepared, because a motivated seller typically has a property with issues you need to be sure you can solve.