The lid for added height is a great idea. The Detolf is superb for getting a cost effective long cage but it does fall short when it comes to height and width. The roof cuts out the height problem and you could always put 2 Detolf side by side and just remove the glass inbetween. I came across an image of someone who did this on one of the German forums, I saved it as I liked the idea, if I manage to find the original source I'll link it but have attached it so you can see what I'm talking about. I think if you did that plus the roof idea you would end up with a fantastic cage - although it would take up a huge amount of space
