If your tracing is good, and you folded it exactly on the vertical line, then there should be no reason to redo them. If it's off, try again. Paper is cheap, wood isn't.
RCAircraftNut and Beaver, I came up with a statement about remote control aircraft laws. America, ban Idiots, not RC airplanes!
Slow and steady. Cut out a few every day and soon it willstart to look like a ship. Patients and perserveerance Grasshopper.
If it's decent quality. Cheap 3-ply is OK, but look for a smooth even-grained piece that isn't warped. The more plys the better though but the more there are the more money they'll cost.
5-ply baltic birch will do fine. If you can find some local (cabinet stores or whatnot, others might know where to find it) that would be best, but if not, Rockler has good plywood at not too steep of a price. http://www.rockler.com/baltic-birch-plywood-24-inch-x-30-inch
You might want to look back through the responses to the previous five times you asked this question... Short answer is yes, a fiberglass hull is a much easier starting point. Beaver starter with wood (surprising?) and was successful, but he is the exception to the general rule that when new people start with wood hulls, they usually never make it on the water. The difference in price (if any) will be less than the cost of gas/tolls to drive to and from your first event
Okay, so I'm going to buy Battlers Connection's Lion hull. (If there are other suppliers tell me please)