The exact % will depend on the actual location of property, but that can be determined online fairly easily once you have a particular property in mind.  

It's too big a project to sum up easily. 

Everyone wants to hit a home run when it comes to multifamily, but it's easy to fail as a property can easily go "off the tracks" when you lack experience or the funds to keep deferred maintenance issues from building up.Find a property that works for you both in terms of financially and physically and remember that this is your first big multifamily purchase, not your last.

It might depend on how much you have left on your mortgage, also do the math a rental might net you a couple hundred dollars a month in cash flow, but depending on the size of your mortgage payment paying it off could easily increase your cash flow by $1,000 or more per month. 

The black matter does come easily. 3) Based on pictures, I don't think their is a leak behind tiles.

It was very hard to justify on my SFR's because I could easily handle all of them.*** Assuming I did in fact go with a PM....what would be reasonable rates/fees for a property my size and condition?

If I was offering 8% to my investors, I doubt they would invest, considering that you can easily have a higher return in the US while taking much less risk.I imagine that your concept of container homes is new and unproven and that therefore you don't want to promise returns that are too high in case you couldn't deliver them.Also, don't you think that there are better places in Mexico for the container homes.

Trenton NJ is infamous for being a "rougher" area in addition to being the seat of NJ government.

I find that if you put cleaning materials easily accessible in the unit, guests will even vacuum.

I can easily pay the mortgage for a $40k house if I delved right into it.