Hi
My A1200 used to be in a desktop case (IBM PS/2 one I think...) before I managed to get hold of of a decent tower case. I mounted it with the PCMCIA slot sticking out the back and the connectors in the middle of the case, ergo running extenstion cables of required ports to the outside case. It did fit fairly well with just a slight problem as I had a RAM board which did squeeze the front cover off a bit but it was good enough if you 'aint a perfectionist!