Switching HUD on Pawn Possess

I am trying to integrate a building system into my existing project. I need guidance on how to go about possessing a pawn and on possession will switch out my HUD for the building system HUD and controls, then on unpossessed will revert back to the normal HUD and controls. I have spent days trying to figure this out :{ I can possess my pawn and see both HUDs at the same time which I believe is negating my mouse click, I’m having a hard time separating the two.