Seems like all he is doing outside of a normal contractor/investor deal is finding the property. If you are funding 100% of everything why don't you just get a quote from him to do the work and hire him? I wouldn't do this if I were you.
I am a contractor who invests with a partner who funds me, and our arrangement as followed.
We have an LLC formed and buy all the properties under it (which may or may not work for others) in both of our names 50/50. Small bank and he has a great relationship with them.
On a flip he will fund the rehab and take it back upon sale of the house. Everything after that is profit split 50/50. I can write checks for subs but I make no money for any work I do until the house sells. I typically sub out what I can get done cheap and move my efforts to what will save us the most money.
On any buy and holds or flips we buy....if I can't come up with half of the 20% down or whatever it is, he will cover it and I have to pay him back, what I am lacking, at 5% interest on whatever terms I choose. short term, long term, he doesn't really care or hasn't yet. He basically acts as my bank, which I will mostly pay him back lump sum off of a flip within a few months unless we tackle a large project.
other notes if interested
He set up the LLC, I find all of the properties. I manage everything except accounting (his wife is an accountant) Next month I am funding my classes to get my real estate license but he has agreed to pay half of all expenses it costs for me to keep it in the future. We have known each other over 20 years and have a lot of mutual respect and trust.
we try to make our arrangement win/win or loose/loose even if I don't have skin in the game. What you originally posted looks like he can't loose.
Over budget: he gets paid you loose money.
Over time: he gets paid you loose money
I don't like it for you but love it for him! A bit one sided I'm afraid. Hope that helps.