The pent-octagon is going to make everyone dizzy.
My only suggestion would be to open up the section right after the crossover... you won't be going all that fast coming out of the loop, and that section is *very* tight and leads into an already nightmareish box of cones.
Then, as Matt said, all you need are some pointer cones. Make sure that the driver will be clearly directed to the next manuver as they exit the current one. Matt and I like to use the old 4 pointers in a line trick to direct traffic. It seems to work well.
Nice work!