Today was the given over to fitting the sewage pipe. With macerator toilet runs its better to have the rise near the toilet not near the end. My pipe run therefore needed to be as high up under the gunwale as possible. I had planed this when I was battening up. Heres how I fixed it in place.
First I needed to make some clamps to hold the tube in place.
Using a hole saw I drilled pairs of 2x1 batton to make the support and fixing brackets below.
Here they are clamping the tube in place