I've also boxed in the top, again using 6mm thick MDF. It is made up of different sections which I had to cut and angle. A belt sander came in very handy (because cutting those sort of angles on a band saw would have been a nightmare!), so I just cut roughly before the pencil line. Then using the sander I could get the fine angle I needed. I screwed it all in place, then glued the pieces together. So when it's unscrewed it will be one piece.
I know it doesn't look to pretty at the moment! with the screws and all. When I come to painting it I'll tidy it up and sand it where required, then when it's painted it should hopefully blend in.
I took some pics of the piece on it’s own after I’d glued it together, It’s made of 4 different sections. I used araldite to hold it together and it still needs to be sanded to get rid of the excess glue and to tidy it up.
