Box Art by AMT/ERTL
These are JT-Graphics upgrade kit parts to convert the AMT/ERTL K'Tinga Class (turquoise parts) into Chancellor Gorkon's flagship Qo'nos One (seen in Star Trek - The Undiscovered Country).
Furthermore, there are components that are added in the present kit:
And finally, the special design of the warp nacelles:
For all who are interested in the sizes of the spaceships, HERE is an interesting article. Following the arguments of this article, you get a Qo'nos One in 1/1000 with the conversion parts.