This sketch of John Eaves is somewhat rudimentary than the final design. But the early stage of development for this Klingon Bird of Prey is very clear.
design scetch by John Eaves (startrek.com)
As seen in Star Trek Enterprise - this is the early Klingon Bird of Prey resin kit in 1/1400 which I bought. It's a detailed kit with very small parts and 10,3cm in length. The kit includes only the long braces (from the head to the main body).
I corrected this kit with very thin steel braces on the head and the end of the wings. I also replaced the lower rod of each Disruptor cannon and added some plastic details on the bottom and on the wings.