This is the Arvey Model Products Rebel Blockade Runner, better know as Princess Leia's Ship from the opening of Star Wars IV: A New Hope. This tiny model came with the upgrade kit I used for my Star Destroyer, and at 1/4222 scale, fits nicely in the hangar bay of the AMT/MPC kit.
I added a small strip of styrene for the top radar dish.
And drilled out the engine blocks:
All finished, a quick weekend build that looks great with the rest of the 1/4222 fleet.
There is a newer kit of this ship by Utar Ships also in 1/4222 scale. I hope to have my hands on it soon to do a comparison work up.