Not by Amalgam, but Kurz made a private beta for his personal collection. He's the guy who made Mugen War stage. Anytime he would show off his private works to friends, he'd get attacked by the eletist minded so he's kinda dropped out.
Kurz was not a trader, he just wanted a couple friends to share some of his personal edits, and people treated him like crap for it. Granted his stuff was way over the top, and incomplete, but it was only for his personal enjoyment.