I'm trying to recreate the old 2013 gui because they aren't built into the clients them selves (I'm using the 2013 client) but scripts won't actually do anything in there if I put them in manually. Please help!
You can not modify core scripts but you can turn core gui off:
game.StarterGui: SetCoreGuiEnabled(Enum.CoreGuiType.All, false)
Put above in a server script. Next, we need to hide the topbar:
game:GetService(“Players”).LocalPlayer: WaitForChild(“PlayerGui”): SetTopbarTransparency(1)
Put above in local script.
Of course, this isn’t the answer that you were looking for. But that is okay, since you have days of UI making ahead of you. Good luck replicating all of the old UI