Still crashes (quick emulation test only). Either there are more autoconfig related bugs or A590 v7 ROM requires KS1.3 for some reason. Note that you can't test in emulation without recompile because of "KS1.2 or older = disable emulated autoconfig" test.
Anyway, if someone is interested in doing more tests, Kickstart v1.2 rev 33.180 autoconfig base register fix is as simple as changing single byte in offset 00004D9C: 0x2C -> 0x20 (+checksum fix)
(above change fixes this bug: http://www.sintonen.fi/why_ks_1.3.txt