Would love a version for A500/2000, even if it cost a bit more! 
IMHO making it A2000 compatible is a waste and would make a release of one harder and most likely vaporware. Let it be A500 only. (looks like it will work if you hack the drive cage on the 2000 and remove floppy on the 1000 afterall)
A2000 owners have lots of cheap options for a CPU upgrade.
If they do try to make it work with another model, it needs to be the 1000. (Maybe an adaptor?)
ROCK ON