Nobody had an answer to my question but in case anybody is ever interested: the fresh pipes run down the left side just inside the left frame. That's the cold water pipe in the upper right of the photo. The hot pipe is right beside it.
At the powder room they split and head off to the washer area where they come up through the floor just behind the right side of the pantry door.
Photo is looking forward from just behind the front axle.
I cut the pipes and used sharkbite connectors to put in a drain. If anybody ever wants to reconnect the pipes, they can remove the drains and use the sharkbites to reconnect the rear plumbing.