Just no clip inside, or find the buttons above the door frame. If I can remember, those buttons should be above that door and it should still be pressable even if the buttons are on the inside. There's no proper way or obvious way to get in because this vtol was made for a cargo vtol with 2 shuttles being this creation and in the cargo vtol it has its own way to triggering the shuttle doors to open the doors to this creation plus this is a test bed example.