Construction of the DINOSAURS ROCK-et EXTREME was essentially the same as my Level 3 project. The emphasis here is to build the booster section as solid as humanly possible. Not only were the fins fiberglassed but they were fiberglassed to the motor mount. See photo below. Not seen here is that I also fiberglassed the fins to the body tube on the interior of the rocket. When completely dry Mega Foam was used to fill in the entire booster section making this one solid unit.