_KermitI'm not sure how to have it only show up when low health and not buffed as, as far as I know, the colour of the image can't be changed for buff, only low health. If people wanna mess around with it/use it you can find the relevant files here.
You 'abuse' the PlayerStatusHealthBonusImage image to 'fake' the health bar moving horizontally, you set HealthDeathWarning in the spectatortournament.res HealthIcon value to 1.001 and make the HealthBonusPosAdj the size of the entire player panel (where the health is the same size as the player panel)
The overheal color is controlled by a drawcolor in the guihealth file BonusImage section and the actual low health color by the HealthDeathWarningColor in the HealthIcon in spectatortournament.
If anyone gets it working properly give me a shout please, I'd be interested in how it works, especially as I'm pretty sure the tftv one is kept private or w/e.
First one to get it to work afaik was the Mannterface (relevant hud files)