Working full time with a family doing fix and flips or buy and holds is not scalable.

Their website says "We are experts at creating turnkey, scalable systems that generate high-quality leads month after month… even in crowded marketplaces" but my experience proved otherwise.

Seems like a decent idea.It is certainly feasible to use the income of the tenants to lower or eliminate your housing expenses.It would not be a scalable business plan.

I want to enjoy and try to have fun building a business model that is scalable and automatable without having loans in my name, so no risk w h a t s o e v e r. 

Are these returns/cap rates scalable/realistic to larger projects?

Sounds like you're wanting to replicate InvestorCarrot or LeadPropeller but for contractors.I don't think there will be enough demand from contractors for a service like this to sustain a business though.Seems to me like it would be a smaller more niche business model rather than something scalable. 

Set up a scalable business model where are you have seasoned agents on the ground who specialize in investment properties hunting for you, Property management companies to quickly on board, and closing attorneys that can close deals fast for a reasonable price.

In my opinion you need some money to get in the game...unless you are out door knocking day in and day out (which is not scalable) you will need money for marketing (direct mail, online) to start getting the phone to ring.

The DST also works with the individual child Series structure (just like a parent Series LLC), so it is infinitely scalable.

If it is real estate and business then get's trickier as you need to find an operator/owner type. 80% of businesses are owner/operator and not generally scalable.