Great idea! The P/O wrapped my harness and rigging connections in something like flashing tape and screwed to side of boat. It did a great job holding water in.
I toyed with putting it under deck but just too much drainage down there for me.
I used 2-1” pvc gray tubes like chuck suggested. Used a 90 deg bend behind the helm. Mounted under gunwale.
1 tube is electrical. In retrospect, could be smaller since I’ve moved batts forward. But I still need rigging for rear electrical stuff, tabs, lights, speakers, engine electrical cables
1 tube is engine rigging.
I mounted them using pvc pipe clamps. Stagger the clamps if necessary. You can adjust pipe sizes as necessary.
I recommend using pvc primer and heavy gray cement if you can get it. I couldn’t but have had no issues using regular cement when you use lots, twist it, and hold it together.
Great question, chuck gives a solid approach.
Ps you can easily run a pull string afterwords using a small cloth or paper towel and a vacuum.