In this episode of B is for Build, the team works on their Lamborghini Merci logo, addressing issues with brakes, alignment, rear bumper, tail lights, and a broken front axle. They fabricate a side mounting piece for the bumper and discuss the cracked spoke on one of the wheels. They install an auxiliary power system using a lithium-ion battery and plan to convert the car from all-wheel drive to two-wheel drive. The team makes progress towards their goal of test driving the car.