I'm not sure, but I will guess and say they won't let you decorate the tables yourself. Especially if it is in a location that you need to be escorted to.
You can bring your own decorations for them to set up though. You will leave them at Francks a day or two before the wedding, and they will put them out. They will charge you if you bring more items then X amount (honestly I can't remember the amount, plus they have changed it since I signed the contract).