The fuel sender is shrouded by its own cylindrical baffle, so that the fuel gauge reading is unaffected by any surge.
Six mounting points were added, each one strong enough to hold the fuel tank on its own. Probably over-built.
Lots of testing followed for leaks, unusable fuel and fuel feed. Fuel gauge was calibrated. Then it was off into the sky.
Now with 50 litres fuel, I can fly for 2.25 hours or more. Great. If only my bladder would last that long!