Interior lining

Before the beds can be installed I need to line the walls. A helpful retailer suggested 3mm MDF board. It is light, easy to work with and not expensive especially compared to other options. Cutting the holes for the windows was a bit of a pain, the old adage 'measure twice and cut once' should have been more strictly adhered too, it would have saved quite a bit of time and materials.

I have bought two sheets of 4.75mm MDF for the ceiling as I feel the 3mm will sag eventually.