I ask about the type of foam because, well, because it's cool....
But also because I also have a surfing addiction, and lots of high-end custom boards are being made with exotic foam cores, reinforcements, and carbon/glass weaves to adjust the flex patterns. Thought it might be interesting to compare the materials (by the way, I'm a complete "armchair board shaper", having never made a single surfboard or bow- just like to keep up on where things are headed.)
And I'll probably stick to wood-core bows until you guys do a couple decades worth of R and D, since I'm BROKE.