Only problem that I encountered: it is too small for people like me wearing glasses.... So I downloaded the lasercut files from Google Cardboard (the attached file on this site) and changed the width, the lens mounts (the Dodocase attaches the lenses with a sticker, Google cardboard squeezes them between 3 pieces of cardboard, I prefer the Dodocase solution) and added an option to connect elastic bands to it, so you don't have to hold it all the time :)
Step 1: Lasercutting the Changed File
I used Coreldraw to adapt the drawings. Red lines are for engraving/kisscutting, black lines are to be cut. Use a nice cardboard that isn't too thick (~1,5 mm).
Step 2: Assemble
Assemble the case just as if it's a regular Dodocase. Add some elastic bands to wear the case without using your hands.
Step 3: Happy VR'ing While You Wear Your Glasses :)
Enjoy your bigger Dodocase :)