You are very generous to help your son establish himself in the business like this.
He is 17 and will get a credit for homeschool with this project.
When my older children were jrs and srs I funded up to 30 credits each at the local college and it was both hs and college credit.
We still have to get through heavy equipment II, Class B and CDL. He is a good worker and an asset to any crew. The voc school is telling me that he is exactly what the local companies will hire, polite, well spoken, and with a good work ethic. I am proud of him.
I have a lot of experience in this area...let me just say this:
He can make an EXTREMELY good living, if he learns from a craftsman how to do the detail work (showers, tub surrounds, patterns, backsplashes, etc.), in addition to the larger jobs. Guys who are very detail-oriented and meticulous are in such demand I cannot begin to explain it to you. It may take him a little while to get there, but once he gets that reputation he will end up training his own crews to keep up with the work.
Have your extended family let him “practice” in your homes...you could all end up with some great-looking bathrooms & kitchens...LOL!