Financial Backer Of Residential Home

I have been given the opportunity to financially back the construction of a residential home for a builder who has credit problems at a significantly lower than market price. I would really like to pursue this and make a substantial profit upon sale, but want to make sure I cover all my bases before jumping in. I have never done this before and am hoping to get some feedback from the experienced investors on this list. I will have my lawyer draw up paperwork once the builder and I come to an agreement, I'm just looking for some input from you guys as to things I should ask the builder... Some examples with figures would be great too. Thanks for your input. Merrie