This is the kind of work I specialize in. Would go in with my D8K's pulling Cat No. 80 Pans. A short hop of 1,000 feet makes this set up very cost effective. If the going got a bit tough would put D7 behind to push while loading. Also need a dozer to spread the material as it is placed by scrapers. I don't understand how you think a "motor grader" is going to do anything on this job. Grader is great for finish work and placing aggregate but nothing else. For finish shaping I would use a small dozer with six way blade.