Physics constraint car parts

hey peeps,

im trying to replicate GTAs car destruction by having the doors and panels on a car be removable.

i can have the parts detach and become physics objects upon impact easily but i cant figure out how to have the doors come loose and flap around since you cant hook up a physics constraint to the root of a vehicle.

ive managed to do this using physics constraints in the world but i need to assemble the car inside a blueprint.

is this one of those features thats just not implimented yet or does anyone know how to work around this?