I didn't make this, it was originally made by Overv; I just took 20 minutes out of my life and fixed it, the original can be found here: https://gmod.facepunch.com/f/gmoddev/mwlo/Layers-Tool-Construct-in-multiple-layers/1/
Put it in its own addons folder, restart server.
Make sure you put this in its own addon folder, if not make an issue request with any errors you may be getting
I'm not responsible for any exploits this may have, I didn't test any of it I just fixed it :)
if you do a pull request, atleast tab your code correctly thanks