Wall tents are absolutely wonderful, but very space limited if everyone's sleeping and personal gear is kept therein. A issue for us is no one in our camp is going to move a muscle to keep a fire going all night. Purchase a good sleeping bag, go to sleep and wake up with no interruptions at the designated hour in another tent. That way one does not have to deal with 60 or 70 degree swing in temperature over a night.
We ran a party of 5 with one wall tent and two unheated sleeping venues this past fall. A 12 by 14 was perfectly fine for cooking and evening socializing.
