All in all very good. However, there are a few difficulties I have with it.
First off, there are too many turrets, and it lags my game to scrap. I suggest only adding in the ones that are of absolute neccesity. This should reduce lag. Also, in my opinion, the doors should automatically open when you walk through them. This is achieveable very easily, and will not cause much lag. Finally, in the neck section, you have the player go up 1 block to the next jump tube, but when in gravity the wedges you have as a decoration block the way up, and I recommend you fix that. However, in spite of this, it's a very good ship.
(one small side note: there is a large table just off sickbay. I have no idea what it is for, and I am hoping you could explain. If it's a conference room, try opening it to the corridor.)
http://starmadedock.net/content/star-trek-constitution-tos.75/