Putting together a prototype or concept can burn through cash and time for OEMs, but two U.K. firms are trying to mitigate that cost.The engineering firm and design firm are looking to harness the flexibility and accuracy of designing in a virtual 3-D space, along with experience in building low-volume cars.The pair has already teamed up on this imagined Lotus 2+2 that's theoretically only a year from being road legal.