I've heard of kits becoming ARF's, but not the other way around. Why? There's thousands of plans available for everything from a .049 free flight to 50% and larger scale. Can't think of an ARF other than a scale model of something that I'd want to build; if it's a scale model there are much better plans available for one of those. if you want to build an ARF from plans, just get a good set of plans for the bird you want, and leave half the framework out of it.