How much value would a web site with direct booking bring to this kind of arrangement as compared to listing on Furnished Finders, VRBO, etc, particularly if we stick with the mid terms.

It sounds like you're at a stage where you're ready to scale up.

At least until y'all make some agreements to clear that equity ownership like an inheritance arrangement doc. 

I was struggling with finding a lease agreement online that reflected that arrangement.

I too am in the process, granted the beginning stages of leaving my W2 job, to pursue real estate and just got licensed this year. keep up the great work!

Popular examples include Airbnb, Uber, and Buffer's early-stage pitch decks, available online for free.

Now I am in the early stages of development.I am working with a consulting firm to help with a concept plan, engineering, and to get the city to sign off on everything.

WE wont put it on the market until its about 30 days out from CO. the other market were we are active Loudoun County VA We have 3 subidivisions going in the platting stages from 35 lots to 250 lots.. all of them have contracts on them from National builders the 35 lot is Toll  the bigger ones are Lennar..

I would also suggest doing a hard look at the staging and photography of your place.

Far too many get stuck in the "paralysis by analysis" stage, thinking they just don't know enough to get started.