I WOULD LIKE TO TURN MY ATTIC INTO A BEDROOM FOR MY OLDEST DAUGHTER, IT DOESN'T NEED TO HAVE A BATHROOM. MY ATTIC HAVE THE CHRIS-CROSS BEAM AND YOU HAVE TO ENTER THE ATTIC THROUGH MY WALK-IN CLOSET. THEIR IS A CLOSET IN THE HALLWAY, THAT I WOULD LOVE TO USE AS THE STAIRS. HELP CAN IT BE DONE?. HOW MUCH WILL IT COST ME?