Hi,
Ideally I would make a door sliding with a remote control that Gordon hold in his hand like a key-button for the cars. I though of the satchel remote but without the bomb.
That seems difficult to obtain if at all so on a second though I would be happy with a sliding door which slides open in 2 moves.
1 vertically to go out of the chassis and then
1 horizontally to slide backward like a car rear door.
This door would be triggered by a bare button.
That remains dauntting but technically I guess it can be done. It would be easier with some clues to make it like numbers of entities and brushes it require to be achieved ...