I was going to post my thoughts but Mugenkidd beat me to it. (Hi Mikey) My only diff in idea would be make it simple by using one of the thread topic icons which are on the left side of every thread showing usage and hit factor. Make the thread mark blue for KITS and red for ARFS. And then as Mugen said,,,
What I wish we could do is have the warbirds forum as is but allow the poster to choose, while starting the thread, to post weather it has to do with kits/scratch built or ARF. Then give an option when you enter the forum to look at kits/scratch built, arfs, or both.