Also worth checking out: Bill Shen (plasmo) has his Tiny68K (in a number of variations including '020) system and one for the RC2014 eco system. The original:

https://www.retrobrewcomputers.org/doku.php?id=boards:sbc:ti...

More recently: https://www.retrobrewcomputers.org/doku.php?id=builderpages:...