I decided to convert one the Fujitsu Siemens cases into a more generic PC case. This was harder than it looked:
Started like this:
Removed the various metal framework - the RAM card front bumper thing, the lower card protection door thingy, the lower front fan cover
Removed the old part-working CD Drives including their rail thingies
Remove floppy drive from the other PC and install in this one, so it has two (the other PC now has both green front panel blank plates things, so it doesn't need the HDD cage at all)
I have 6 drive bays to fill (two cases). I have rails for four drives and I have two faceplates. One build however will use both a faceplate and the a rail (mounting a 3.5" bay in the 5.25" bay) so I electrical tape one of the dead drives in place!
Remove heatsinks and mounting plate so I can remove the the old motherboard
Remove the Socket 603 heatsink mounting holes that are part of the chassis and stick out as much or more than the standoffs
relocate standoffs
(re)install front and rear 120mm fans
Remove PSU (it's enormous!)
Put ATX bracket onto SFF PSU
Put AT bracket on ATX bracket onto SFF PSU
Install SFF PSU (It's tiny!)
Realise the power button connector is all one blob and is non standard. Separate out the power button using stanley knife
Realise the power switch is not long enough to reach the motherboard, order a new one (and pwr and HDD LEDS) from eBay.
Mount motherboard, GPU etc
Faff about with poorly seated RAM and the PC remembering its overclock (despite clearing the CMOS twice) that I was very keen to avoid given the SFF PSU is not that powerful
Install Windows 7 yay
(this is fine!)
I trialled it with my 1156 motherboard as it is (usually) pretty reliable - just because it's the biggest I have, and it still looks reasonably proportioned in there!
Not sure what to actually put in it now. Maybe I'll get a 754 motherboard. Annoyingly it doesn't have AT mounting points which I thought it would given the PSU situation.