That's an interesting idea, but I don't know how well it would really turn out. Almost all whiskies, after being blended, are "married" in an oak cask for some amount of time to allow the blend to integrate. (Even a single malt is really a "blend" of whisky from different casks. Only "single cask" whisky is truly unblended.) It's a nice novelty, but going a whole bottle at a time could become a pretty expensive trial and error process. I'd also be apprehensive about not being able to sample either the component whiskies or the blend as it progresses. If I were able to go to their facility in person and do it hands-on, it would be a lot of fun.