The numbers don't seem to work out when analyzing it as one deal. 

You would have to work out with the GC what you wanted to do yourself, and see if that works for both of you.Here is the Florida statue that discusses the GC requirements. http://www.flsenate.gov/Laws/Statutes/2010/489.103As for the drawings, have you thought about buying pre-made plans?

I hope things work out for you.

At the end of the day the investors on here are not writing you a check if it doesn't work out what they said as an investing idea. 

Owner financing would not meet his goal of closing next year but you could work out a monetary or housing concession for the delay.  

Whatever you do have a termination notice built in that you can exercise fast if things do not work out.

But be vewwy careful that you don't get upside down if it doesn't work out like you want.

@Sergei Genchev You'll need to work out an agreement with your agent.

I would not hesitate to do it again as long as the numbers work out,  GGood luck with your venture.

I know ... there is NO incentive for FCI working any harder and create a workout.