I bought two of these expecting to make mistakes with the first, it didn't happen.Just don't make the body too tight which will give you problems with the laser cut base to fit in. chamfering the base to fit the body is also worthwhile. I recommend the rocket tube be put into the body from the bottom, your call. How does it fly? Brilliantly, a vertical lift higher than I expected and very stable. All this from sheets of cardboard. I highly recommend this very easy build rocket.