My work on my Excelsior drawings has stalled, mainly because of questions about the internal structure and even more specifically about the warp core and other engineering details. To get back on track I have decided to go back to the beginning and start with the TOS Enterprise and see what I can figure out. And while it didn't exist when TOS was made, the NX-01 details are helping to fill in the details. In some ways the TMP Enterprise might be a better place to start, but as I have gathered images for the Excelsior warp core, I have come across quesitons about the TMP warp core, the function of various parts, the location of the fuel and many other things that I think exploring the TOS Enterprise might help. Now, I am not just jumping on this topic because I just started working on it, I have been analyzing the TOS Enterprise for 40 years. I used to pour over the Franz Joseph plans endlessly. I have watched the series more times than I can count. I have come to a few conclusions about the ships as we see them on screen - the sets are inaccurate. The sets are designed to serve many locations, especially in TOS, and very few sets were designed with the real interior of a ship in mind. They were designed for the convenience of a camera. So although the sets were 10 foot tall or more, they had open ceilings for lighting, and everything was wide enough for a camera crew to easily work in. The TMP sets were more confined and much more realistic, but even they have flaws and only a tiny fraction was built. So in both cases, the sets lie. So I will be taking the sets as a guide and fleshing them out to something more realistic. Right now I am just doing the cross section and a rough idea of the decks. For TOS Engineering, I am taking a cue from Star Trek II and placing some things to the side so the classic engineering room is going to be just one half of a larger complex that sits right over the main Warp Core. For my main sources I am relying on the original TOS cross section that Matt Jefferies made. It does not match the description, but it has some key details that pinpoint the location of some areas in the ship. I'm also relying on the external details of the studio model. I've started with the Casimiro drawings because of their quality.