The small plate on the bottom can only be seen in The Motion Picture. During the later upgrade to the Qo'noS One, it probably fell off and was no longer replaced.
The narrow rods at the top of the neck section are no longer in place on the Qo'noS One. For the K'Tinga I added it with spring steel wire.
At the rear neck (to the main body) was missing a wide strip on either side. I added it with plastic.
I have also adjusted the two small detail areas to the studio model. The now white parts were previously whole blocks. Now, like the original, there is a gap so that you can see inside.