Not in charge of this FE, but to find out how to make one, here's a post to help you get started: (not all are sewn, some are done from Duct Tape and are EXTREMELY cute!).
http://www.disboards.com/showthread.php?t=1219607
Here's another post about FE gifts:
http://www.disboards.com/showthread.php?t=1980639
Also, there is a FB group called
DISNEY CRUISE LINE FISH EXTENDERS (It's a closed group so you'll have to ask to join to help hold down on spammers)...they discuss both FE's and FE gifts....
Also, as a BROAD statement about FE's:
1. I don't know of any FE group that has imposed a min/max
2. Generally one gift - either one per stateroom, or one per person, or whatever you feel comfortable with - I personally do one stateroom gift (geared more to the adults) and then one gift for each child (something a bit more "fun" - but not expensive).....depends for me on who is in the room!
However, I also know some who have done something where you do get one gift each day (but they were smaller?? BUT no less useful or appreciated!
3. Depends on the group whether they decide to tell you when to deliver
4. See answer #2
Hope that helps.......