once priced a job that was at the bottom of one of these big towers, not as high as this one like , basically the job was to erect a scaffold 9ft high appros 30 mtr by 30 mtr square which once erected went over top of all the cabins toilets etc etc and we would of created footpaths to all cabins toilets and the access , egress point at bottom of tower, among the scaffolf then all the top was to be double boarded because at 400ft if an engineer drops a nut, bolt or tools etc etc a fallen item would go straight thru a single baton , so double boarded to protect everyone underneath anything bigger than a small hand tool eg spanner would still go thru both boards :nuts: