Thread: "Room of stout construction"

18mm MDF is bloody tough! Don't forget to line the ceiling as well. The lining needs to be screwed to the frame otherwise it can just be kicked free. The outward opening door is good but it needs two deadlocks about 400mm from the top and bottom. A 1.6mm steel sheet on the outside of the door, folded and screwed onto the edges is also preferable. I have built a couple of them over the years.