You could just send Robo up there, the conventions over and we dont need him anymore.
Starting from the edge and working your way up is the best way. You dont have to replace the planks if you check them out and there ok. You may want to do more nailing as you go along. Where there is water damage the wood may look good but it could be punky, stick a knife in it and see how it does. But if you have the money and time and friends replace the wood planks with plywood. Dont buy beer until the jobs complete. Remember once you open up an old house or building anything can happen. Well good luck.
"Nothing else can poison our culture, corrupt our society or ruin the character of our people like unearned money or unearned opportunity." -- James R. Cook
"Fooling around with alternating current is just a waste of time. Nobody will use it, ever." Thomas Edison, 1889.