This is a dream of mine come true. I actually emailed Sega a while back asking if they would sell me the rights to Psycho Fox since they don't use it, and haven't since the '80s. I wanted to re-make the game to look exactly how you've been able to achieve here. Sega replied by giving me a postal address to their legal department, but I never got a reply to the letter I sent.
Actually i'm not sure sega owns the right of psycho fox as they aren't the developper, it was Vic Tokai, but they don't do games anymore since long so who knows what happened with the game's rights... i'm pretty sure they would find them faster if they had to sue you for it though lol