I know most lenders have 6-month seasoning requirements, but there are a few that can do cash outs at 3 months and even fewer that can do it instantly. 

Down payment would still be $60,000.Of course if buyer defaults on the loan I would still foreclose, and I would require home insurance/property tax in escrow like the banks do.Do you think this would work?

You will want your vendor agreement to confirm their status as an independent contractor but workers comp insurance policies apply to companies that have employees and I believe is required in all states besides TX (don't quote me on that).

I don't think a brokers license is required here in Kansas, where I live in order to manage properties. 

Are the sellers requiring you to use your VA eligibility to assume the loan? 

Correct, many lenders require a 6 month seasoning period, but there are a growing number of lenders doing 90 days or less right now, especially if you can show that rehab has taken place.Are you currently looking for one in Detroit? 

Let me know if it is possible or not, and in both cases what would be the requirements? 

All the things they offer are services you can do yourself; email the cleaners, message the guests (which requires you give them your Airbnb login info), contact service providers if there's an issue, but not from a network of providers, just Google apparently.

There are just some markets that don't require you to be that good.

As an agent, you can certainly still be an investor and look for land to buy, BUT your state likely has laws requiring you disclose that you are a licensee.