I have had clients successfully execute the rent by the room model up and down the front range.

This way, you can determine which broker's model fits your plans the best. 

Since credit scoring models treat hard checks on our credit in 14-45 day chunks, is it a good idea to do the refinance on my home as well as pre-qualify for the rental property together so that our credit scores aren't affected too much??

There are iterations of the turnkey model, but here's a general overview of how turnkey providers make their money.

From what I gather, acceptable examples of "income" can be from modeling jobs/photo shoots, or I can hire my son through my RE company (I suppose he can "help" clean up properties).

They are usually in the $330k-$400k range depending on the model.

Depending on your situation and business model I would want references and a credit check.

I am considering buying my first mobile home park, but most information online is specific to the lot rent only model, and this park owns and rents all homes at the moment.

We purchased a property with the traditional model before we really understood BRRR.

What is your business model?