Re: What material to use for bundeling wire harness and cables?
check grainger for wire loom, split loom, etc. they will have wide variety of colors and sizes. a small zip tie makes a good way to secure a wire loom to the hull. For tape, use self-fusing silicon. It won't melt open like electrical tape. For wire splices nothing beats a good barrel crimp & solder with a bit of heat shrink tubing. If in a wet location you can get tubing that has an thin inner coating of hot-melt glue.