The devices from the innate power don't disappear<em>until you stop using them</em>, so by a strict reading you should be able to get away with a lot, but I guess it's probably not the writer's intent to let you conjure car parts one by one and have them all stick around as long as you're still driving the car.  Oh well.<br/><br/>Still, as long as materials are present (and they clearly are), Scientific Method seems to handle all our "build things absurdly fast" needs.<br/><br/>It looks like Engineering doesn't get Perpetual Perfection, which I was seriously considering for whenever we level up...but then, Cutting Edge is probably even better.  ("I figured out cold fusion during the drive over here.  Gimme fifteen minutes to rewire the van.")