Lots of variables on that one, but more than a $6k charge.  

What percentage ARV do you shoot for?

Wood has a huge variability in strength--between pine varieties, the stress which can cause them to fail varies by more than 2x and you can see 20%+ increase in strength as it ages.Then I have stress concentrations which will yield and then redistribute the load in practice, but not according to the calculations I'm allowed to do. 

However, there will be a segment with a high percentage of reliable people.

The numbers don't make sense to me, based on their descriptions.The most dubious is "First page search impression rate"Airbnb defines it as the percentage of time your listing shows up in the top 10 results when a guest searches for a location/date.I have 30 listings in a market with 20,000+ homes available, and they all have a "First page search impression rate" of 40-60%. 

There are a lot of variables....I will say I don't usually advise to wait for rates to come down.

I have been offered a proposal to partner with the broker on a house what percentage do I ask for if I am providing all the labor and he is the money?

If you pay cash you'll pay yourself back percentage back, if you use the a hard money loan the refi would pay that off and the difference would go to you

You'll only be able to cash out a certain percentage of that existing equity.

I am just financing the deal in an unconventional way that only a small percentage of banks have experience working with.