Having built and flipped houses on the side I can say it is not a easy nut to crack to make it in the building business. If you think flying is a cut throat business it pales compared to the building business, there is simply NO LOYALTY only lowest cost shoppers in most cases. Do your research and go into the field with a open mind or you could find yourself in a world of hurt. I prefer flying and since I live in domicile I get to spend more time with the family than most builders or medical professionals that are my friends. Sadly since you moved to part 91 and 135 flying you are not that competitive to be hired at the majors. Do not kill the messenger simply stating the current situation "no way I would get hired at FedEX today" as my time was much like yours. My relative is a pilot hiring person at a major and it is crazy what they are looking for.