The computer is an Optiplex 5050, so it is a small form factor case and also the pcie x16 slot butts up again the power supply so even taking the case cover off wouldn't help unless I were to remove the power supply.
If I remove the p/s it would work, ugly but functional. Shame as its a nice looking case imo.
In any event I'm leaning towards picking up a motherboard and harvesting the cpu/ram