Warp and impulse drives with some inner workings done. I do not like those nurnies inside the nacelle of the studio model as they absolutely make no sense there. So I made some warp coils instead.
Now there are only a few things at the back left to model.
Some words to the references: I’m using photos of the official physical model and the CGI model that came later to the series. There are some major and minor differencies between both and it’s impossible to say which one is more accurate. So I decided to go with the things that I like most of both models.