I forgot to mention, for the A1200 I would like to see space for an mediator and atleast one expansion card using a flexible riser cable.
i cant picture how that might be possible without producing a bulky monster of a completely unergonomic design. even though i hate tower conversions i fear mediator will never fit into a wedge case and also it cost hardly justifies using it with only one card. for my part i consider mediator 4kdi the only worthy compact alternative that fits perfectly into a genuine amiga case without destroying it.
edit: except if someone did something similar like c128 -> c128d, which would be quite a pretty thing, especially the carrying handle.