hi guys,
I just found this - supposedly supports autoboot if you have KS 2.05 or above.
http://www.students.tut.fi/~leinone3/ide/
The adapter plugs in to the 68000 socket, and the 68000 is placed on top of it. There is one IDE-connector. IDE-signals are buffered and generated with XC9572(XL)-TQ100, and the adapter also pretends to be the same as in Amiga 600, so it autoboots using KS3.1/V40.063 KS-ROM. So far, I have not tested the two boards I have assembled...