Here are some pictures of a Mydal bunk bed hacked for my daughter.
Step 1: Reduction o the bottom panel for a smaller mattress (140 x 60 cm)
Step 2: Assembling the external structure + MDF panels
Step 3: Integration of 2 BESTÅ frames (Ikea)
Step 4: Painting
Enjoy!
~ Jean-Christophe Witmeur