My floor is 6' x 4' I think. If I remember, it's called a Super Shack or something like that. Don't think it's made anymore. It's right at 6' tall when set up so there's plenty of head room. It's very comfortable for 2 people and I wouldn't go any bigger.
The only thing I don't like is that the fishing holes are right up against the wall which makes it very hard to actually look down the hole and sight fish.
my fish trap voyager is perfect for two fat guys, lots of moving and standing room, still got room in the sled for the dog to lay down in if she goes, room enought for 3 holes each ,both vexilars and 2 heaters in necessary..(only used 2 when fishing at night when it really got cold.