Bus can you let me know what you have. I'm in work 18th then back in on the 23rd.
FYI there are some motherboards that come in the AT form factor that also have the ATX power supply connector, i.e Gigayte GA6BA. I had this fitted in an AT box and an ATX box, the ATX box has some plates on the back so you can fit either an AT or ATX motherboard, AT you have seperate parallel, serial ports etc. Also ATX boards only accept PS2 type keyboards. Box costs around £25 can be got at computer fairs
http://www.advancefairs.co.uk or
http://computer-fairs.co.uk I've been down this road and may be able to help you out.