Yes. It's correct. Size of 16" is perfect for widest range of users.
BTW. Your jetpack is amazing. You have great skills. Congrats !
Great looking work. I will probably start work on a costume for Halloween. Two questions for you (I did read the thread but didnt see either mentioned - I might have missed it).
What did you use for the back plate (probably should be the strongest backbone piece...stronger than foam board to keep it solid)?
And what foam board did you use - was it stuff like this: Office Depot Brand Foam Boards 30 x 40 White Pack Of 3 by Office Depot ?
This is a really nice job as others have said here. If I get going on mine, I will post the progress and the oddball parts I use (and from what). Great and helpful forum here.
I just used foam board for the back, but I reinforced it from the inside with more strips of foam board. It was just the regular stuff you can get anywhere.