Also, once you have the pattern displayed on the face cutout standee, you don't need to keep it in your pocket's pattern slots. That frees up a pattern slot, which is very handy. (Just make sure to save your standee pattern with the Able Sisters, though, so you don't lose it!)
You can have up to eight standees (or a combo of eight standees and eight custom signs). Different ACNL guides will give you varying numbers, but trust me. It's eight. I learned that the hard way when building Goblin.