Do a search at some of the past post talking about this subject but installing PVC pipe was the best thing I have done. I eliminated 90% of the flex hose "the expensive stuff" last year and used only short peices as needed for areas that I could not put the PVC in easily.
If you use a heat gun and a little time you can make simple bends in the PVC to hug the hull
Lots of people are afraid of doing this because of fear of movement might break the glue joint or pipe. In our installaiton I have enough span that makes the pipe be able to move to prevent this. The short pieces of flex is used at the tank and pump out fittings.
I've did this last year and several others indicated that they converted many years ago with no issues. Cost was less than $50 US.
Just another option