How would i make a global Leaderboard as a SurfaceGUI?

Here's my idea. For easy reference, put the SurfaceGui into the StarterGui, then use the Adornee feature. Once that's applied, have a while true do loop that uses HTTPService. (If you need to learn how to use this, go to the Roblox Wiki.) As soon as the player gains a point, have the game check if their score is higher than any on the leaderboard that is being uploaded cross-server by HTTP. If it is, then it will rewrite it.