@Fadi Great looking bike. I was also thinking a layered approach but didn't think about gel. Thanks for that.

I intend to keep it the same shape/profile. The foam that is there is pretty decomposed and from what I can gather it has been repaired before because there is some hardened 'spray foam?' in the corners. I am going to use the old vinyl seat as a template, I will probably have to shape the foam from it as well.