I don't see a reason why you would want to go the trouble of towering the a1200 when you have a a4000. a4000 will outperform it in everyway and it will be less hassle. A good ecs system is also recommended.
I have one A3000/040(warp engine, X-Surf), a2000/040(gvp combo, EGS Spectrum, X-surf), a2000(action replay 3), a1200/030(MKIV desktop) and a soon to come A4000. I also have a spare a1200 mobo and blizzppc+bvision which I wanted to tower, but since I don't see the point anymore I'll probably sell them.
Also the A3000 and A2000 setups became quite similar. No point in keeping them both probably. I may also dismantle and sell one of them.
