My Mom was crazy for walnuts. She didn't really like the taste so much as the process of getting the walnuts processed. She loved to do that!
She would call people every fall to see if she could get walnuts from their trees again this year. She would drive all over two counties to pick them up. Then put them in the driveway, like your Dad did, but she wouldn't wait until they were dried. She had a little child's toy rake that she used to separate the nuts from the hulls. She then put the wet walnuts into "toe sacks" which were then put out in the sun to dry. When they were dry, the walnuts were taken to a table in a corner of the yard that existed only to process walnuts and pecans. She would take a hammer and a brick, the same red brick was used for years and years, and crack each walnut. There was an indentation in the brick from having zillions of walnuts cracked in the same spot. The walnuts were then put on cookie sheets and dried in the oven overnight. Then she would sit for DAYS and DAYS picking out the meat with those nut picks. She gave almost all of them away as Christmas presents.
I never saw Mom any happier than when she was processing walnuts. She did it right up til her death at 97 years old.