And when you said the management company takes a 550 credit score , all I see in your future are evictions .   

New construction, fully decked out on the design and amenities. purchase price 785K, 40K in seller credits, 120-140k gross rental projections What made you interested in investing in this type of deal?

I have been to the 3-day and it is a well run event, by professional persons. 

Where buyers/tenants can view dozens of properties in a day to screen out less desirables then schedule with a real agent to see the home in person!

With Tiny Homes, a person can get all the upgrades that want like that in a larger home.

My recommendation would be to engage an investment property focused realtor (not a general residential realtor) and let that person guide you through the process from pre-qualification to market/property valuation and selection. 

DSCR loans go up to 80% of the purchase price and depending on the Debt Service Coverage Ratio and your credit score you can expect rates on a 30 yr loan ranging from High 6%- Mid 8%. 

I personally would fix the 3 windows and maybe consider cutting the rent a little more to gather more interest. 

It also depends if your tenants have good credit they care about.

Real estate investment is my future.This amazing voyage begins with setting personal goals and vision.