I have a proof of concept web page and can provide a personal story and touch.

Why not look for an owner occupant directly rather than going through this person? 

I'm starting to feel saving some towards 20% down payment now would be a good idea as my loans have 8 years left on them and not really a rush to get paid off.  

Based on your fact pattern (was a personal residence first and then a rental, not vice versa) I think you might be looking better.

There are some other sources Im sure but Ive personally used the ones I recommended.

Personally I don't really care for the upgrades.

Here's an article with some examples: https://finance.yahoo.com/personal-finance/one-extra-mortgag...You can also search for "early mortgage payoff calculator" and enter your own numbers to see how extra payments impact your mortgage.

There are no laws, rules or regulations preventing any foreigner, American or otherwise, to buy property in CDMX or Mexico for that matter.If, by having success, you mean getting a profitable investment, I'm sure many American and other investors got that over the last few years (I personally haven't since I've focused my efforts on Mexico's beach markets, which are far better in my opinion.

From what I keep seeing on MLS and from what I know of friends trying to sell cabins it sure doesn’t feel that way.  

Feel free to send me some deals , which you really hate to let go.At least it will help others.