Pictures?Too late now but for others...... I use a 2X4 or better a 2X6 of the most rot resistant pressure treated wood to close off the entrance edge of the concrete. Then I form an apron in front of it at the approach to the door. I leave the outer edge of that apron open so the truck can back (or if you are lucky, drive) up to the internal pour. When the floor is filled I ask the driver how much concrete is left and adjust the outer form to accommodate the remainder. That way the overage you must order to be sure of having enough becomes an apron approaching the door. The pressure treated 2X6 stays in place dividing the apron from the floor to avoid cracking. I have been doing this for 20 years with great success. Recently I put 1"-2” of blue or pink insulation under the apron just before the concrete goes down and it does not heave due to frost here in the north land. If I am really thinking I frame another pad in front of the man door and the last bit of concrete goes there too. If we run out I mix it later in my borrowed mixer with gravel from the perimeter back-fill and Portland cement with rebar and insulation. It always feels like I get something for nothing as the concrete would be wasted otherwise.