Coalition League

My idea is to set this up as a "League" where each week a coalition is matched up with another and plays a match between them, and we do a round robin where each team plays all the others, followed by a playoffs of say the top 4 coalitions?

I'd suggest that matches be played as follows:

For each match-up there will be a "home" team and an "away" team
The "home team" gets to choose the map, while the "away team" gets to choose the victory conditions and starting money.

The matches will be played with a matching number of players on each team, depending on how many of each coalition showing up, with a minimum of either 2 or 3 players per team. The question is do we set up a specific weekly time as "league night" or do we allow the coalitions to set their own schedule based on availability of team members. The plus side to a coalition is always knowing when the games will be played, the downside is that depending when we set it, not everyone would be able to make it. The upside to setting the times themselves, the teams could make sure they have fuller participation, but it could be a pain for teams to figure out a time when both teams are available to field players....

Thoughts? Comments? Suggestions?