1. Measure the area of the daybed that you want to be the bed area. I used the mattress as a guide so the cot was 135cm long by 80cm wide. The mattress is not perfectly 80cm wide so it left a perfect gap for the cot rail.
2. Cut the cotbed rails to size. I bought one for £12 on eBay because I knew I’d be chopping it. I only made a rail for 2 sides, but if you have enough pieces you could go all the way around.
3. Optional: Sand and paint the pieces white (I wanted them to match the bed base). I needed 3 coats of a water based wood paint, a thicker gloss would probably only need 2.
4. Screw the pieces together so it resembles a cot so it stands alone ready to screw into the bed.
5. Clamp tight to the BRIMNES bed frame and screw it together. I screwed into the baseboards along the width, and into the inside frame along the length at every other cot pole.
6. I have added a support bracket to the rail end here as it just wasn’t stable enough, I’ll see how long it lasts it might need improving.
7. The small part of the mattress becomes the bed base, and the additional extendable pieces become the seat base. You could use a full length daybed mattress but this allows easier sheet changing and a more stable cot frame.
I added cushions around the edge of the cot so she doesn’t bang her head (this was a problem in her previous cot), and used large cushions to provide a backing to the seating section.