Alternatively, a private or hard money loan could provide faster funding if traditional lending timelines don’t work, with the option to refinance once the build is complete.

Serious investors may pass this by on the info provided.

I'm struggling to understand some aspects of your response, but it provides some things to think about.

The more time you spend talking about other options and try to build up the negatives, the less time you are spending on what you fell are the positives of your own idea.If you believe that you are onto a great idea using L2P option contracts and forming partnerships where someone else provides 100% of the money while you provide 100% of the real estate-related functions, then start it up and make it work.  

We provide new construction rentals and PM (single family, duplexes and Quads) for investors.

I filled out their survey and provided some constructive feedback, even though I don't own a STR here.

Be sure to check out the free tools BP provides to help analyze deals you may have and also market insights.

It's important to keep in mind that everyone you hire is providing you a service - no one is guaranteeing you any outcome.

Quote from @Stuart Udis: I am always skeptical of these real estate "gurus" and course providers.

I would find out who the manufacturer is and send it to them and confirm they will provide a warranty on this.