You need to think long and hard about doing a 1200 tower conversion these days, most people seem send a lot to time and $$$ before coming to the conclusion that they prefer their desktop.
If you just want to play some games/demos and muck about with WB then you are better off upgrading your 1200 and leaving it in the original case. There's some great new HW out there for us 1200 owner's to play with. I'm currently building a SATA SSD/56Mhz 030/16 bit sound card enabled beastie with a chunky gfx mode for new game development
