It's a good diagram, but weren't the big power units in S2/3 roated 90 degrees? I do like all that extra engineering space at the bottom left though! Might that be the dilithium room from Alternative Factor?[/QUOTE] Yes, I think they were. They were shown both ways, so just chose one. The dilithium room is on the other side, in similar spot to the reactor room in TMP (in these plans, engineering is in the same area as in TMP). Possibly it became the reactor room in TMP during the refit was the idea. The layout of it is odd. I had to watch the scenes from Alternative Factor a lot to understand the layout. Seen here: http://tos.trekcore.com/gallery/thumbnails.php?album=53&page=10 and http://tos.trekcore.com/gallery/thumbnails.php?album=53&page=16 you can see that Kirk rushes into an anteroom of sorts (where the short machines are against the wall) from a corridor. If you look close in the episode you can see from the 2 camera angles in and outside the room, that the wall seems to have an angle to it, with more short machines: http://tos.trekcore.com/gallery/albums/1x27/The_Alternative_Factor_176.JPG So when Lazarus knocks out the redshirt, he hides in that room's corner enough to not be seen by the girl, so I put in a small door to another room that he could have snuck into. Again, just my interpretation. Not trying to hijack this thread, but just to add my own experience when trying to map out the same stuff blssdwlf is doing. Nice to see another Lightwaver btw.