Lotus founder Colin Chapman's famous mantra was "simplify, then add lightness," and almost 60 years after the famous engineer introduced the Lotus Seven, Caterham has figured out a way to shed over 10 percent off the weight of the already lithe space frame chassis. The trick comes from bicycle construction. Caterham worked with British bicycle tube-maker Reynolds Technology and a computer-aided engineering firm to create what they claim is the world's first automotive space frame that uses…