I'm kind of cooking up something in my head using Schedule 120 PVC pipe, some nice sanded and varnished plywood gussets, possibly slipping over a lifeline stanchion with a guy wire running thru the top of the stanchion and attaching at two angling points behind the stanchion for support, having the pipe pivot on the stanchion (with lifelines removed for use) and probably a stainless plate mounted below the stanchion on the underside of the gunwhale for additional support.
The whole thing would assemble with stainless bolts, washers and wing nuts so it could easily be broken down and stowed, yet simply assembled in a few minutes.
The whole thing would assemble with stainless bolts, washers and wing nuts so it could easily be broken down and stowed, yet simply assembled in a few minutes.