Love your channel, I see you don’t use any metal reinforcing steel rods before you pour the floor. Is this a special concrete that doesn’t need any steel reinforcing.?
We call them Hilti Guns but they are a Powder-actuated tool. They are used to shoot nails into concrete so framers use them for walls, Insulation we use them for hanging drape in basements and I use them to attach foam board to walls if there isn't the concrete pins that come off the wall. If there is I'll push those through and hammer them over to hold it, if not shoot a 2 1/2 nail with washer
So you sent your friend can't drive his car up there so after you get done with this building think about concrete and the driveway or blacktop in the driveway to where he can drive his nice little car up there or for being a kind of a joke get a car holding trailer put it on your truck and go down there and tell him well we'll just put your car on the trailer so you can have your car but you can ride in the truck there to the shop