Mirror Accessory for Canon 6D

I use my Canon DSLR for astrophotography. The problem is that, while my camera is pointing up, the LCD screen is pointing down. My Canon 6D doesn't have a swivel screen so I have to crouch or get down on my knees to frame and focus the subject. It's awkward at best so I made this thingy to attach a mirror to my camera.

The three pieces form a z-fold so that the camera can be rotated 180° and the mirror can still face upwards. You can forgo the middle frame if the camera will never be inverted