750m (assumption, could be any other size)
I turned the ship by 35° in the horizontal plane, so it sits diagonal in the printer. This way it also fits into the maximum size of Processed Versatile Plastic without having to split the model into two parts. If oriented straight, the model is 240mm (9½in) long. This doesn't affect the price for Versatile Plastic, but it makes the model extremely expensive in Detail Plastic (over $650), that's why this material isn't available here (would have been over $450 anyway).
This is my take on the Vulcan Cruiser seen on the display of Daniels's device from the future in ENT: "Future Tense". There are many ships shown on this display from the 22nd to the 24th century. Next to this ship you can read "Retrofitted Dorsal Carrier, Design XRT-55D, Commission Date 3125"
and many sources on the internet believe this belongs to this ship. But personally, i believe this belongs to something else on the display, as the commission date would place this ship about 1000 years after the episode. For this the whole ship looks too much like it was build at least not too far from the moment of the episode (2152) and probably not long after the founding of the Federation in 2161, as then the whole ship design of Starfleet (and therefore all its members) was changed to what would later become the USS Enterprise. In the show, as also this 3D model is basically just a kitbash of parts from the Sh'Ran model. There is no size available for this. In order to make it larger than the Sh'Ran (600m) but not too big on the other side, i choose 750m for it.
I like to think this is a design Administrator V'Las had ordered to be build for his planed attack on Andor. Bigger and more powerful than the Sh'Ran Type or the D'Kyr Type ships. Those were still under construction when V'Las was forced to speed up his plans because of the interference of the Enterprise crew. When V'Las was removed from his post, it was logic not to waste all the resources already spent and so the few ships that were almost finished were completed, while others that were in an early state of construction were scraped.
If you need this in another material, size, or quantity, send me a message. I will try to make it as you need. Be sure to read my comments below my shop page