I'll be down to participate too, especially if we're doing an asymmetrical gamemode.
Also, I initially voted for TC, primarily because I was thinking of Fubar's TC/Tug-of-war collab back in the day (which died out before it even started), and since I thought a large map would allow everybody to contribute something significant. However, considering the large coordination required for a TC map to work properly (since everything has to fit perfectly together) I'm thinking any kind of multi-stage A/D would be a much better idea.