Bubbletop was NOT bulletproof. I think I saw this on a show titled “50 questions about the JFK assassination” just last week. Bubbletop was not bulletproof so we can all draw our own conclusions as to what the effect would have been.
http://3.bp.blogspot.com/-9murlfjujU8/TfKyTJ34QPI/AAAAAAAAAQ8/fmTeajXyds0/s1600/05.JPG So this might be what a bubbletop would like.