Here's the cover. Turned out better than my first one from a year ago...
http://thecoop.110mb.com/MUSHA_Cover.txt
Just rename the file extension from ".txt" to ".jpg" and you'll be golden. 110MB doesn't like image files being directly linked to without an html page attached with it, so you have to get around it by changing the extension to ".txt" (kind of like the old Geocities trick back in the day).
Anyway, I'm still working on the manual, unless someone can find it in the halls of forgotten Sega-16 threads.