Jesus. Iban, and for that matter myself have done this. Me with the Survival RP Stats HUD (yes I sapped code from Iban) and him with the brilliant Health bar HUD. He used swatches so we don't need different bitmaps unless you want an odd shape. It's possible, it would require someone to have the client sided HUD, and the server to have the server sided HUD, but it would work.