Update: New world download created using World Downloader. This downloads entities and custom map items! Some more rooms completed....still a lot to do.
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These are some screenies of the NCC-1701 build I am doing. The exterior is 99%. But there is a LOT of internal work to do; many cabins, med bays, etc...

The build is 1:1 scale

• 286 blocks long
  
• 131block diameter saucer section
  
• 69 blocks high from top of saucer to base of hull
  

Built in near vanilla Survival on the community server I play on (not owned by me). It is small, quiet, but very friendly server, enhanced vanilla (e.g. mob griefing is disabled), but all blocks are mined/crafted by the player, and there is no flying, so this has been a bit challenging (a) to build in the air and (b) to get all the concrete I have used so far.

Server Name: Cubic Worlds
Server Address: play.cubicworlds.net
Website: http://cubicworlds.net/

Update:
I have uploaded a schematic. But some points to be aware of:
1. As mentioned, much of the interior needs decoration; I will post an updated schematic a few months down the line as it becomes more complete.
2. The schematic was created using WorldEdit, and for some reason, no entities (such as item frames/maps, paintings, armour stands) have been saved. So where I used these as decoration it is missing.
3. You can import this to your world using MCEdit; if you are using WorldEdit, the following information may be useful;

• The "anchor point" (that is, the place where the schematic is built from when it is pasted) was taken while standing on the top northwest corner of the ship's bounding box.
  
• Size is 286X / 71Y / 131Z blocks.
  
• So if you're standing somewhere ready to paste it - first, face east, then you'd need 285 blocks free ahead of you, 71 below you, and 130 to your right for it to fit cleanly.