The ship IS a box, because thats how the GTA liked to design their ships. It's FS canon (I'm strongly against heavy modifications of any ship featured in a FreeSpace 2 ingame movie). Ever since Terrans and Vasudans became friends, ships in the FS universe underwent the equivalent of the change in automobile design from the 1970's and 80's to 2004 - they went from being extremely boxy and hard-edged to being super-cucumber-smoothed.
With the exception of the Colossus.
If someone ever HTL smooths the Orion please shoot me. Only a few details would be needed to spruce up that beautiful destroyer, by the way. And Turambar's interpretation of the textures is absolutely wonderful.
P.S. this thread has inspired me to do the OPPOSITE of what someone else said -- taking Deimos textures and putting them on an Orion? Nah, I plan to put Orion textures on a Deimos...grin*