Rebuilding maritime industry from Cornwall

After a non-nuclear plague kills 70 percent globally, could a Cornish polity with 25 percent of its former population and surviving hardware rebuild firearms, machinery, railways, ships, and fueled internal-combustion equipment?

Basic industrial recovery is considered feasible if enough skilled people survive and feeder industries and iron supplies can be organized. The firearm era and reliable internal-combustion fuel supply remain unspecified.

The scenario assumes a non-nuclear plague has killed 70 percent of the world population, with further conflict leaving the Cornish polity about 25 percent of Cornwall's present population. It retains pre-collapse hardware and enough technical knowledge to attempt rebuilding industry. Cornwall's tin, silver, copper, lithium, china clay, and nearby Plymouth tungsten facilities provide useful raw materials. Falmouth offers a dry dock capable of taking Bay-class landing ships, cranes, and other facilities, while the neighboring yacht industry contributes fiberglass construction and naval-architecture skills. Production of feeder components, surviving specialists, and maintenance of the roads remain essential. Iron would have to come from suitable sources elsewhere in Britain. General industrial recovery is considered feasible, but the exchange does not specify a firearm era or settle reliable fuel supplies for internal-combustion equipment.