Aspen Center for Physics Puns

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I made what I want by combining few RigidBody2D with PinJoint2D. In that case bodies correct collided, and start rotating if force applied to point belong at left or right of center mass.

But now I want to optimise it (I will have a thousands of that objects) and use only one RigidBody2D with few CollisionPolygon2D.

This is my code:

extends RigidBody2D

export (int) var engine_thrust
export (int) var spin_thrust

var thrust = Vector2()
var gravity = Vector2()
var rotation_dir = 0
var screensize

# just a CollisionPolygon2D now but will have mass variable in future
const BLOCK = preload("res://Scenes/Ship/Blocks/ShipBlock.tscn")

var blocks = Array()

onready var sprite = $AnimatedSprite
onready var engineFlameSprite = $EngineFlameSprite

func _ready():
  screensize = get_viewport().get_visible_rect().size
  
  create_block([Vector2(30, 0), Vector2(-30, -30), Vector2(-30, 30)], Vector2(0, 50))
  #create_block([Vector2(50, 20), Vector2(-10, -10), Vector2(-10, 50)], Vector2())
  #create_block([Vector2(50, 70), Vector2(-10, 40), Vector2(-10, 100)], Vector2())
  
  
  
func create_block(var points, var position):
  var poolVector = PoolVector2Array(points)
  var block = BLOCK.instance()
  block.set_shape(poolVector)
  block.position = position # doesn't have any effects for physics :(
  add_child(block)

func get_input():
  if Input.is_action_pressed("ui_thrust"):
    thrust = Vector2(engine_thrust, 0)
    engineFlameSprite.visible = true
    print(get_inertia())
  else:
    thrust = Vector2()
    engineFlameSprite.visible = false
    
  rotation_dir = 0
  if Input.is_action_pressed("ui_right"):
    rotation_dir += 1
  if Input.is_action_pressed("ui_left"):
    rotation_dir -= 1

func _process(delta):
  get_input()
  
  $VelocityLine.points[1] = linear_velocity.rotated(-rotation)
  $GravityLine.points[1] = gravity.rotated(-rotation)
  $ForceLine.points[1] = thrust

func _physics_process(delta):
  set_applied_force(thrust.rotated(rotation) + gravity)
  set_applied_torque(rotation_dir * spin_thrust)

The form of the space ship doesn't matter for force, only for torque. Even if I use add_force function of RigidBody2D that has offset for point to which force applied. If I apply force to left or right from center of mass, the ship