keep it simple for the first time shaping, dont over shape, dont over think, every blank has a board inside that it wants to become, just take it slow and it will all work out
US Blanks 510 Comes standard at 4 1/2 NR, 1 7/8 TR you shouldn't really need to go anything to far from that but your rocker dems posted above do look good, they are right where you want to me. If you want a small wave board i find Flat to Vee best for fishes for my personal use, also i enjoy single throughout but it really is up to you and how you surf. Flat is fastest and i like speed. As for fin placement just use the Mckee setup i have it on a 55 super flat rockered board. Post up pics when you start.