This sounds fun. If you don't mind a random stranger, I'd be interested in the 6th slot. Probably ranger or maybe a paladin (back-up meat shield?). I'm in the US eastern time zone.
Weekends works best for me,too. Pretty much all day Saturday is open and Sunday afternoon (after 1pm EST/10am PST). My home internet can be flaky sometimes, but I can easily get to a location with good broadband.
You mentioned vendors are ok to use, does that include the brokers, too?