To have a running linux-user-m68k should be a more reasonable target.
Then we can think to run a linux kernel but we have to emulate a 68030 or 68040, a nubus bus, nubus cards and Apple video cards.
There is no opensource version of the Apple ROM and it is copyrighted.
Other emulators have succeeded in emulating a 68k Mac. I am sure we can. Instead of providing the ROM file, we could always provide directions on how to obtain the ROM. I have seen directions on obtaining the ROM by using the application TomeViewer to extract the ROM from an Apple firmware update file.