I dont see how a crack in a well lining could make your pipes rattle. I'm not saying its NOT the case, but I think I'd look at something else first. It sounds like a water hammer issue to me...that is your pipes are banging in the wall when water runs then is shut off suddenly. I'd bet the lines in the wall aren't anchored very well, however this isnt always the case. You may need to install water hammer arrestors, open the walls to anchor the lines or even a combination of the two. Like I said, I'm not saying it couldnt be something the plumber has stated. I'm not there and he is....but if it sounds like a horse, smells like a horse and walks like a horse, I wouldnt immediately start looking for zebras.