A friend of mine, who I can guarantee is a better player/theory crafter, used to build BOTRK fairly often on Lee Sin top. Considering the item got buffed recently, I wouldn't be too surprised to see it. It works surprisingly well! You benefit a lot from both the stats and the active to be an annoying duellist bruiser, pretty much. I don't think it's optimal at all, but it's more of an alternative play style sort of thing.