My Logo Coaster

This is my very first 3d model! I have been using some variation of this emblem/logo since I was 11 years old. I've iterated and tweaked and remade it dozens of times over the years in 2d, even recreating it in the old Call of Duty emblem customization. So I figured it would be the perfect first project for teaching myself CAD. And what more perfect use case for a circular logo than a drinks coaster? I took the dimensions from an old rubber coaster I'd been using for years (100mm diameter, 7mm tall rim). It was originally inspired, despite appearances, by GoldenEye 007 which I played on release back in 1995. The spiral pattern on a black background originally came to me from the intro to that game (and I later realized, all 007 films), when Bond is walking across the screen being tracked by the camera inside a rifle barrel. The spirals represented the rifling, and originally didn't extend all the way to the center. The “aperture" itself also, strangely enough, does not