Space looks tight under the quarter berths, so the expense/fuel capacity ratio might not be worth it. Using the lazarette area might create issues with trim. Is this for long-term cruising in places that don’t have diesel to sell, or for a one-time long-haul voyage? We used jerrycans lashed in the cockpit to go transatlantic on a smaller boat. Kept cost down and weight relatively low – especially once fuel was used – and reduced volume of cockpit in case of boarding waves.