When the tournament rules mention 'White' and 'Black', presumably 'White' means the first player (White in Chess, Red in Xiangqi, Black in Shogi) and 'Black' means the second player (Black in Chess and Xiangqi, White in Shogi)?
The first round will be a true round robin (meaning everyone plays everyone) only if exactly seven players participate.
If my understanding of the Buchholz-Solkoff and Sonneborn-Berger tiebreaks (as explained here) is correct, then this page's description of Buchholz-Solkoff is incorrect, and that of Sonneborn-Berger is incomplete and potentially misleading.
Oh, and sign me up, please.