I have all the NatGeo topos with coodinates for the ride if anyone wants them. I broke the 450 miles into eleven 8.5" x 14" PDF's. I never rely totally on the GPS so I'm planning bringing a set of these printed out waterproof paper (2 sided) and manually drawing the route with a marker. I tried to reduce it to less pages but there wasn't enough detail to navigate by.
PM me an email address if you want a set, they're in 2 zip files, 3.4M & 1.6M.