Ever Since Sonic was released, i've been hoping for someone to make a Metal Sonic mod, The only characters i think he could fit over is Mario, Luigi, Tanooki Mario. I know it it would be best over Metal Mario, but Sonic i already over him. so i really dont know how that will be pulled off. but whoever is Interested in making this happen, I wish you good luck.
I would like to see it happen but Im still not to sure if it will be anytime soon because this would be EXTREMELY hard to pull off. Perhaps at least supplying a model would help. Never the less some great Sonic characters are all ready WIPs such as Shadow, Knuckles and Amy not to mention you can already play as Big The Cat. GL to someone taking on your request anytime soon but we can only hope as I'd like to see this as a reality too!