I just looked at the specs of these sort of things and I think your biggest issue with keeping the case is the way that they have a fan shroud set up to suction over the cpu. If you use a different motherboard, with a different socket, it will be likely that it won't quite line up right or it won't fit. If you were to remove the fan shroud, even then, I'm not sure if you could fit a heatsink in their comfortably. You could definitely extract fans and powersupply though. There is very little in such an old machine that will likely be worth salvaging other than that though. An issue you might run into with the power supply, though, is that it is likely old and will only have a 20pin connector instead of the more modern 24pin...So all in all, there isn't much you can salvage because of the date of the machine and the propriety of dells designs