Plot: Two weeks into the new house raising, master carpenter Norm Abram meets architect Chris Adams for a tour of the first and second floors. At the Bensonwood shop in Walpole, New Hampshire, plumbing and heating expert Richard Trethewey meets plumbing contractor Lynne Keating to see how she is running PEX water supply lines and ABS drainage pipe to the back-to-back kids bathrooms, both of which are assembled in the shop as one pre-built "module"