Hi , sorry for the long delay in answering. I did not get a notification. I’ll do my best to answer your question.
For modifying the HUD based on the current pawn, you would probably want to bind the values displayed in your HUD to values from the current pawn. Follow this tutorial, but get the values from the Current Pawn reference in ATBTT_GameMode. This should cause the HUD to update automatically based on the current unit.