update.
I've made numerous changes to the model since last time.
1) Pretty drastic change to the main impulse engine. I studied some screen-caps very closely, and I've made the engine taller, stick further out, and slightly wider at the base.
2) Changed the battle-bridge area. (Thanks Neb)
3) textures added to the main bridge.
4) Made the escape hatches a touch yellow.
5) changed the nacelle grill texture to be brighter when lit up.
6) moved the drive section rim windows forward. They were too far back.
7) changed the phaser array colour to a warmer shade of gray. much more accurate now.
8) textured the saucer indentation for when the ship is separated. There are virtually no good references of what's there, so I decided to put in what I could figure out, and then mirror some details from the cobra head, so that it won't look empty.
9) a bunch of other minor texture changes and re-mappings.