Acetone (used to clean up) eats some types of rubber gloves, make sure you talk to the supplier about the proper safety gear.
I have done some fibreglass work in the past, but am far from an expert, hopefully someone more qualified can give you advice.
For the damage to the tail, I would probably make up an aluminum bar to match the shape and glass it in to the back of the panel to provide support, it may not be necessary though.