How much do you think it would cost to build this house if we could do much of the work ourselves?

This is my dream house.
We’d have pro framers come in to do the frame-out and hopefully they’d let Chris (my son) and my husband help. We could staple up the insulation, then have pro siding people come in and do the siding. My husband can run all the wiring then have an electrician come in to actually hook it up. He can also do all of the plumbing (that’s what he’s done through the years.) My son and husband and I can do all of the sheet rock, and we can lay whatever floors we need. My son can also shingle the roof. They both have extensive experience in these things, so I’d trust them to do it right. My son, in fact, is ready to take the test to get his construction license, but he doesn’t have the money yet. I think it’s $600 or something

Also, it would be out in the country, not in town.