It's still in development and he is open for suggestions. But i think you are not the target for this lowcost card. Just like Mr B said. It is meant for some A500 users who wanted to use modern IDE stuff and maybe play a few WHDLoad classics. Not a big power upgrade like other turbocards.
Currently you can get an 8mb autoconfig ram board from Kipper2k for $49 an IDE68k board from MKL for $60 (I have both) and the aca500 has been estimated to cost the same as these two combined
This is homebrew hardware, not a real retail product with full guarantee. You can't compare that.