First constructive progress. Until now it's all been stripping and clearing out but yesterday I collected the CNC (computer) cut frames from Jake at TranzCNC and started to fit the lining. We need 200mm of spray foam to achieve the Passivhaus u-values with thermal bridging eliminated as far as possible. Hence the fancy frames which form the basis of a second skin inside the hull which only connects directly at the birch ply frames. I designed these from a laser-scanned section of the hull. All quite hi-tec but still a great relief when they fit. They get screwed directly to the steel with common sense defying self-drilling fixings and are connected together with 50mm square section timber stringers which fit in the cut-outs and run the entire length of the barge. Feels great to be actually building something after weeks of planning and preparation. First fix services and dry insulated floor next.