I would like to add some further information. As the drawing hopefully indicates there are four types of error that are possible. We will be providing procedures for all of them.
As far as the limitations of the quality of the equipment we will provide in the kit, there shouldn't be any reason to look for better. We are hoping to source all of the parts from online vendors as stock items. In fact once we are sure of the correct sources we will gladly supply the information necessary for anyone to purchase them directly. Hopefully this will allow reducing shipping costs further.