Yes there is  a u type  bulkhead that is  a  upside dowu   glued to the fusalage  like  5  1/2 inches   behind  the  nose cone. so you are saying you   just added a bulkhead there  and  glued it to the cowl that already   has  reinforcement going horizontal  and the upside down u bulkhead. If i understand you  have no other   square box that you built going from the original bulkhead forward to the rear of the new engine?? If i understand you correctly you didnt do that but just added a bulkhead   near front  and  glued to the cowling??????