You should consult an attorney for the written agreement or to remove him as He could blame you for delays for any number of reasons or he may he willing to walk away.I would be happy to discuss in more detail if you would like.  

Most will give you a free consultation. 

Contact a local architect/engineer for a detailed consultation specific to your project/locale.

@Lincoln Wu, to ensure you are doing things the right way, which is the only way - you need to consult with a credible SEC attorney.

Always consult with your attorney before you rely on the above information.

You should consult with a securities attorney to find out what you need to know.We did a webinar with Alan Cowgil that covers this - it's posted on the MAREI Facebook page under videos.

The required items are identified by a HUD approved FHA 203k Consultant or an FHA approved appraiser.

I don't make offers without consulting some of them.

Consult with an attorney for contract questions & protection.

I'm not a legal professional, so take this for what it's worth...I would recommend that you find a good real estate litigation attorney, use the upfront consultation to determine whether the other party has a case or not, and then go from there.