Despiked Koopa Shell

I printed out the remix by pdiefend super scaled up as 1st place prize for a tournament that my brother in law is doing.
I also printed out a smaller version for 2nd place.
My brother in law wanted one for third place that didn't have spikes, but when searching, the only one I found was super different from this one.
So to have a similar shell design, I just brought this one into TinkerCAD, messed around a bit, and removed the spikes.

There's still obviously some remnants of the edit, but with some sanding, it should look nice.