Last year Volkswagen got everybody jazzed up with its Bluesport mid-engine diesel concept. But who knows when we’ll see the little “green” convertible chugging along twisty mountain roads. In the meantime, you can always build your own. Mark Smith, founder of replica car manufacturer Factory Five Racing, is building a prototype mid-engine coupe powered by a VW diesel mill. It’s called the Smyth Performance G3F TDI and Smith wants to release it as a kit in the near future. That means you’ll be able to build one in your garage using virtually any compact VW engine (VR6, anyone?). Smith obviously intends a TDI unit, which should get ridiculous gas milage in the lightweight frame. For more info, check out the Smith Performance G3F TDI page.