Finally I managed to upload a copy of the tournament script that DuelMania is using. You can download it on the phpTourney site.

It doesn't support 2on2 or 4on4 modes, but I guess the script could be raped to even do that. (Just create accounts for users like player-A_player-B). Hopefully some people find the time and muse to run some more tournaments. For instance country-based duel-tournaments or an international 2on2-tournament.