[PukkaSilvia]

you only need to roll up some card or similer and make a corner to corner diagonal cross structure underneath and then another one on the front lip of the bonnet and then fibreglass over with the second or third layer. That will strenghten it enough for about 20p and it looks prefectly fine

then measure the bonnet thickness where the hinges bolt on and then put in some wood between the layers in the corners to the right thickness. You can then screw the origianl hinges to it


It wont be strong enough with out reinforcement unless your going to make it really thick and heavy