This is a Spider-Man Into the Spider-Verse Peter b Parker Face Shell i was commissioned to do.
1.- Use the 5mm holes in the shell as pilot holes to mark and drill the eye holes. Uses 1X5mm round magnets, 3 magnets in the shell, 2 in the eyes per hole.
2.- The eye molds can be used to get the right shape for the eye inserts. I use the spidy eye mesh on Thingiverse
3.- Use MeshMixer to seperate the eye pieces if needed.
4.- Added a shell with no holes so you can use whatever size magnets you perfer.
Enjoy