Standard shell challenge rules apply, you can do what ever you want as long as you don't demolish or move the existing wall. You can make the walls taller, you can add new wall inside, just don't touch the existing wall. The chanellege was a request from some of my lovely Youtube friends, I'll be touring them for my chaneel Sunday 22nd March so upload your finished builds with #steeliesims and let me see what's you've created. Have fun! #shellchallenge #steelieshell #buildchallenge #build