I have been building since I was 11, and now 50. So, yes, you "build" a kit, and "assemble" an ARF. I get annoyed too when it is said they built an ARF. I make sure that all of my students actually build a kit to teach them how they go together, so that when they break the ARF's, they know how to fix them, rather then come to me. I am guilty, though too of buying ARF's, but I mostly buy Comp-ARF's and you can't build them, unless you are really good at composites. I do have a couple builds in the works too. Right now, I am "building" an F-18 kit, but it was still molded in a mold. It is like building a ship in a bottle. I always correct my students or others at the field when I hear the term "built my ARF plane".