Patrick,
Those are the same holes I selected, though I included 13 as well. Works out to a little over 6600 yards. With 10+/- yards of elasticity, 6750 seems doable with that combo as well.
What really stands out is the need to precisely place your second on nos. 1, 5, 7, 10, 11, 14 17 & 18 to have a reasonable chance at two putt pars, much less birdies. Today, most decent players have the length to reach such holes in two strokes, but only a very small subset has the ability to precisely (3 or four paces in any direction from the hole) control distance and accuracy from beyond 150 yards.
The two shot holes are monsters.
Mike