its like others have already stated, to expand you must have a more powerful power supply first. then maybe a eide express, connect more ide devices. a 68040 processor with about 32 meg fast ram. say that viper 68040/40 sounds good a softhut. now the second thing you need to do is build a pretty wood case around your a1200 so it uses the natural design of the 1200 for cooling and put all your add ons in the case, and a scan doubler flicker fixer and vga monitor and os3.9. that should do it.give a email address and i will send you a picture, for case ideal. if interested.
