I'm a little late to this post, but I came across this book about building without a GC, which I assume is very relevant. Probably worth the read and the price!
I just purchased this book. Came highly recommended from a builder I know. We just decided to build a custom. Good luck!
Be Your Own House Contractor: Save 25% without Lifting a Hammer https://www.amazon.com/dp/1580178405/ref=cm_sw_r_cp_api_glt_fabc_NW5WPN286MQ5T7Z2VY03