3 Messerschmitts fly again

What type of ducting did you use hard pipe or flexible plastic tubing if so the double wall insulated is best and inexpensive. Plumbing not sure what state your in but California in the last ten years has approved pex piping system very inexpensive may not last nearly as long as heavy gauge copper. But very low cost and easier to install. To maintain good pressure we replumbed our house had to after a slab leak. We ran a new one inch mainline as the service feeder is one inch. Ran it thru the garage exposed then transitioned to the inside of the ceiling all the way to the back replacing the old 3\4 feed and increasing a stable water pressure also brought in s new hot water line3/4 should have made that a circulating system when we had the chance supposedly saves water by reducing the heat up time.