Excellent job,well done! Ive studied all the different foams over the years (audio, memory, closed cell,open cell,etc) for different projects. Modern day Foam is absolutely amazing stuff and knowing which type of foam to use for your project is the secret sauce. For a seat, do you prefer stiff, soft or a combo? Then carving it. Comfortable seats on our motorcycles is paramount and everyone is different. Knowing how to tailor your own seat is a great skill,way to go!