The only gfx card you can fit into an A1200D case without real hacking is the BVision.
However, using a BVision in an A1200D and the BlizzardPPC in conjunction is going to destroy your system eventually, either by overheating or current damage.
The Graffiti is an interesting looking device but not a replacement for a full graphics card. It allows software that is aware of it to use a chunky framebuffer in chip ram.
You could probably hack a Zorro2 bus from the A1200 trapdoor - it has most of the signals AFAIK.
