The plugs are a real pain on the E too. I took advice from a couple reviews and attached them to the fuselage before gluing the halves together. This got rid of the steps but the panel lines still didn't match up quite right and there's gaps on the top and bottom of the fuselage. Furthermore, where the little vents are in fron of the exhausts on the N, this is yet another place to fill and sand and re-scribe on the E .