Dr Shini and her team are tasked with updating a 1940s aluminium boat and a bicycle sidecar from the 1950s. With none of our engineers having made a boat before, they are soon at odds with each other over what size and shape it needs to be. Having settled on a design, the basic structure is constructed from wood, beforeaircraft designer Ivan draws on his expertise in composite materials to apply a fibreglass coat. Ivan is also paired with electronic engineer Louiza to reinvent a cycle sidecar. The pair come up with the novel idea of creating automated mechanical stabilizers to assist with starting and stopping. But, after some last minute mechanical malfunctions in the shed, how will their customised bike reinvention cope when Shini tests it out in a busy city centre? And will it be plain sailing for their modernised fibreglass boat when it's taken on the water for its maiden voyage?

Dr Shini and her team are tasked with reinventing a build-at-home car from the 1930s and a burglar alarm blueprint from the 1950s. In 1936, Practical Mechanics provided its readers with plans of how to build their own three-wheeled car for just £20, the equivalent of £1800 in today's money. The team decide to reinvent this design using recycled parts and a reclaimed recumbent trike. Aeroplane designer Ivan comes up with a novel idea for the steering, an aircraft-style yoke. YouTube inventor Ruth is tasked with welding together the chassis; while carpentry wizard Jacob is building a plywood body to give the car a vintage look. Their do-it-yourself car promises to look impressive, but how well will it perform when it's taken for a test drive on the airstrip? Ruth and model maker Carl are also busy working on their burglar alarm reinvention, which involves some very clever micro-electronics and more than a few surprises!

In 1945, Practical Mechanics included instructions of how to build a two-seater canoe that broke into two parts, so it could be transported by train.For their reinvention, father and son mechanical engineers Pete and Ellis come up with a very modern twist on making a lightweight, portable canoe.Taking inspiration from origami, the team create a foldable canoe made from thin plastic sheeting, fixed together by wooden bolts.It's brilliantly simple in design, but will it float Shini's boat when she takes it out on the water?Ellis and YouTube inventor Ruth are also tasked with modernising the Lie Detector that dates back to 1935.Instead of detecting lies, they come up with a device that uses A.I. face recognition software to detect emotions. They're also planning to set off some clever mechanical gadgets designed to change their subject's emotion.It'shighly ambitious, so will it actually work when Dr Shini puts it to the test?