I have jumped away from only building wood surfboards, I have had the chance to work with foam, the results were great.
Using pigments and old school shaping style. Did not even use the power planer until i was able to be satisfied with my boards without using one. The one thing i do not like about the foam is the wast of foam dust. While wood saw dust can be reused into couple other uses other than garbage. Using the foam dust after being on the floor and mixed with dirt and other debris. I Do not have much use for the foam dust at this point. On the second to last pic you can see how much foam dust is in the shop.
Below are a couple US blanks 10' paddle board blanks, along with couple pictures of shaping some lines in the blank. This is my Tanker 308 stand up paddle (s.u.p.) great for the pacific north west and Puget Sound Paddle boarding. Finished pictures with color tinted resin styling, will be on the next post.