When it comes to the 203k, just make sure you have a contractor start date scheduled, and be sure to contact your consultant (if you have one and its not a 203k limited) to get the first draw scheduled. 

Exit strategy = You may get an awesome rate on that DSCR, but what is the prepayment look like?

getting MHs insured (the actual homes) is a challenge. 

Like any tool, you have to know how to use it correctly or you could get, "injured".We use it to quickly sift through multiple options - and that's about it.BP has a Rental Calculator that includeds everything you are asking about: mortgage P&I, property taqxes, home insurance and percentage for maintenance & vacancy.It also includes Cap-Ex percentage, but in our experience it's a waste of time to worry about this.

Get some land that's ideal, and get a tiny whatever.

Typically, once the project is done you can get it refinanced via the same bank saving a lot of fees compared to HML (Hard Money Lenders).

Many of the properties I have been looking at have issues but in this case I'm working with the seller to let me get it up to conventional appraisal standards before they inspect it.

Roadside Tree Protection Plan.I was told I will also have to get  stamped and sealed architectural plans of the 6 unit building.

My plan is to build along the same type of home, but of course with some of my design inputs.I want to get a really solid foundation before any actual building happens and I would truly appreciate any advice that anyone has to offer of some preliminary items I should know and take care of beforehand.

I would see if you could get seller to pay for the repairs and you raise the sale price by the expected cost of the repairs.