Both shuttle bays (internal). Photoetch escape hatches with slight details. Photoetch transporter emitters. Clear resin nacelle grilles. Resin replacement rear shuttlebay door (Enterprise C has a skinny shuttlebay and the Yamaguchi has a wide shuttlebay. The 1400 model kit has a wide shuttlebay but calls it Enterprise C). Resin Yamaguchi parts (bussard collector, deflector dish)