I first put the small pieces on the flats between the gun positions as this gave something solid to work against as I put the curved pieces on. I would put a long section on one side to divide the sections and then one side just long enough to go by the flat piece already installed. I put glue under the one that would stay and not under the short one that would later be cut off. I had to let the flat pieces set for a day so they would be solid. Then it was on to the round pieces.
In one pic you can see the pieces I used as a wedge against the fairlead to hold it's shape while the glue set. I learned I could avoid this by bending a crease into the styrene. This let the straight section line up and it only took a little time holding it till the glue got some grab.
This morning I cut the holes for the lines to access the fairleads but haven't fabricated the bollards the lines would go to through the fairleads.
The line holes are a little bigger than I like but I haven't anyway to make them smaller. If I use a smaller drill bit I can't clean up the hole and it's really ragged so I guess I'll live with it as is.