Hi MIke,
Although ours is an SN, without the notorious SM corroding copper sleeve, I plumbed my aftermarket holding tanks with 1 1/2" PVC pipe 20 years ago. Annual or so doses of HCl keep the interior mineral build up at bay and rubber flexible couplings at the deck and through hull fitting eliminate vibration issues with the rigid glued pipe structure. Imho, far superior than even the most expensive hose that sewage permeates with smells after a few years. PVC never permeates odors (well, at least for the last 20 years).
Good luck with your project.
Craig