Stumbled across this interesting project today. Thought it may be of interest to some of you here.
http://senileteam.segaforums.com/bor.phpAs the title somewhat suggests, Beats of Rage is a unoffical attempt at Street of Rage 4, a game that was never to be on the Genesis/Megadrive platform. Sprites from King of Fighters have be used to create the unoffical title.
Supported platforms include PC, XBOX, PS2, Dreamcast, GP32 and Palmtop PC.
Other sprite hacks/mods for this game include versions with character sprites from Ghost'n Ghouls, Super Street Fighter, Mortal Kombat and many more!!!
If you could be bothered, you can download the sprite edit pack and make your own graphics mods for this game.
Not sure if it is arcade resolution friendly yet, as I am still downloading it (50MB or so depending on the version).