Hello ladies, I originally wanted to order a signature mat frame to use as our guest book so we could hang it up in our home after the wedding. FI loved the idea, but recently brought up the question of "how will everyone's names fit?" He has a great point, I wouldn't want the names to be illegible due to lack of space. Does anyone have a suggestion as to the size frame we should purchase that would have ample room for our guest list of about 140? I'm sure some couples and families will sign together as a unit, but not all will do that. TIA!