Would not trust anyone else!
Doug:I would not trust anyone else doing this for you. The original plumbing was for a direct overboard discharge. If you are replumbing it correctly, you don't want this type of a setup. You should remove the hoses and take them down and get them the correct size based on YOUR measurements. You may find that this is a stinkin bunch of trouble but it will be a lot cheaper in the long run. At $8-9/ft, you don't want to make any measuring mistakes.