So now the total is essentiall 1.1M saved.Now after about 10 years I’ll have roughly 20 rentals and an average blended principle paydown of 10k per rental.

I would love to have a system that seamlessly does the rental cycle from start to finish, has a tenant portal for payments, and has a good report generation functionality.

You have the ability to auto-request applications (keeps everything easy and in one place - so listing, tenant screening applications, leases and other tools like rent collection and maintenance tracking are all available, just to keep the process seamless).

For sheets, 70/30 Cotton/Poly blend in a percale weave.

I know I can build under $150 a sq ft with garages with my margin, without a garage (this one), that saves $80 per sq ft so I know the blended sq ft I can get lower.

Getting clear on blend you are optimizing for is key. 

If you are seeking a blend of these benefits, then it is important not to evaluate your investment choices using just one metric such as cashflow.A pet peeve of mine is when people take the annual cashflow (*cash throw off) divided by the cash invested (*equity) and call it cash on cash return.

Hard to say I'm always working for my "real" job online as well so it all just sort of blends in. 

Use Hard/Private/B Lending whenever possible.

This may evolve as Xer's like me and boomers become more comfortable with seamless, paperless, signatureless transactions, but Millenials and I-gens don't yet have property to sell for the most part.