Hi,
AMC and AROS can be put in 40MB... If you have a ROM large enough than it will work. I'm preparing a inofficial CDTV revival... as media center / gaming system... will cost less than an AresOne but will just boot into AMC.
One note: We use a mplayer (updated) and without libdvdcss. So most DVD's wan't play if they have copy-protection. It is NO! problem for the user to use another mplayer with this library to play those DVD's in AMC.
A 68k Version is no problem because AMC is made with Hollywood... if someone brings mplayer 68k in a usable form.... It would only work in UAE or maybe on a NATAMI (more or less)