msmith, thank you for your very kind replies. But, altho my husband is an air traffic controller and we have several acres of land, We have no thoughts of landing ANY aircraft here.
Our driveway will be the 4 inches thick, but for the building and the MoHO we want to go a little bit thicker.
10forty2 and Tyler0215, thank you so much for your reply to my query. It looks like we will do more than the 4 inches, but less than the 10. The building itself will be built on a slight slope and Because we saw someone else build like that, we want to go a bit thicker. They did have problems with their garage beginning to slide. We are building a retaining wall and a french drain behind the unit. Again, thank you, I appreciate your replies and your not needing to be snide.