A big "Thank You" to everyone for the kind words.
Start with a shark outline and a little scissors or ?? modifications will work. Exact measurements are not needed. The thickness of the wood being used can vary also--hard woods can be thinner and work well. I have even made pine openers out of 3/4 inch scraps that work; just will have a shorter life.
This is a very easy project with a scrollsaw; could also be done on a bandsaw and then stack cut, I think. The mouth works best from about 5/16th opening to 3/8 or so. the length of the mouth between bottom jaw front and top jaw should extend out about 1/2 inch for the best leverage. The bottom jaw cut should be at about a 75 degree angle, higher is to hard to make fit the bottle and lower weakens the jaw too much. These are approximate figures from my development.
I will enjoy seeing your versions of the sharks!