There are a couple trains of thought in ordering.
1) By the time you get all of the pieces it will be a year later anyway. So you might as well order it all at once. The problem is that you won't know what you want to order until you build one of these.
2). Order only the first couple of segments of the kit so you can see how badly it's designed. Then you won't have very much money invested in it so you can give up on it easier than the rest of us suckers.