As such my market research is based on longterm rental criteria.

Not every state or city mandates that any landlord has to accept Section 8, because the landlord has to not only subject their property to Section 8 inspections, rules and regulations, they also often have to separately arrange for the tenant to pay the non-covered part of the rent and can face difficulty evicting just based on that.

@Karin L Mahmoodi Based on the Georgia Landlord/Tenant Guidebook.

Rent would be ~1,400 to 1,800 / month which is above market rate but housing is in very high demand and price is in line with what seniors who live on their own would be willing to pay based on my conversations with local Real Estate Agents. 

Narrow down your location based off of your comfortability, budget, local property owner regulations, and rent to price ratio, and you'll be building a portfolio in no time. 

It’s like my client in Omaha (where I’m based) :-) he bought a triplex where rents were under-market by $200 per unit.

We sold a $330k rental property with almost no base so we need to do an 1031 exchange of roughly $300k to offset capital gain.

If you had bigger cabins only, definitely not.One thing I would add though is that your returns are somewhat based on your purchase price which you can control. 

I got good at estimating renovation costs by making an initial estimate based on photos/walkthrough, drawing up a model like you see here, then once the project is finished, go to accounting, get the actual expense report for that property, and update the model.

Things like landscaping/snow removal and labor cost for repairs are going to be highly variable based on your market so you'd need to do your own research on the going rate by either talking to other local investors, running your own google search, or exploring basic services on thumbtack/angies list etc.