re: Anyone ever been their own GC for a new home build?

I have a decent amount of knowledge. I worked with my brother all through high school/ college and am blessed now with a job that is flexible and would allow me to be there frequently.
The main thing I would sub out would be the plumbing, foundation, roofing, and sheetrock. The rest I would most likely run through my brothers business.

He has told me which contractor I should use if I go that route but keeps stressing I can save a lot of money handling that part myself.