Gord,
I remember some time ago you promoted inspecting the inside of the square tube frame by drilling an inspection hole under the back seat. It appears you have done that judging by the black plugs in your photo. Not long after you mentioned that, I drilled two 1 1/4" holes in my car and was blown away at the amount of sludge inside. Apparently, bilge water enters through the brake cable tube guides and has noway to get out.
Great advice Gord! Everyone should get the drill out!
Brian Crombie
Land of 10,000 lakes!