My first post in '14 was a platform bed. The details are provided here for framing and securing the bed.
The 2018 model is to show a sort of 'side car' to the main platform. This version is built into our bedroom to provide an angle off the wall and a space for overflow pillows, blanket and clothes.
Step 1: Overall Photos
Notice in the photos how the twin bed tucks under the queen mattress.
---our little friend is available online.. there are a lot of copies!
Step 2: Study Models
Here are a few photos walking through initial ideas and the final model.
Step 3: 'Side Car' Mattress
I used 4x8 sheets of lattice cut in half to provide a base for the mattress.
Step 4: Platform
See in the photos how the platform framing and the supports for the side mattress align to provide support.
Step 5: Headboard Door
The door fits perfectly behind a queen bed.
The platform for the queen bed is built off a 2x4 that spans between the two walls. Two 2x4s standing behind that base support the door.
Secured to the door is a shelf. Stapled to the shelf is a blanket.
Two desk lights fold over the side of the doors.