This is a scratch-built Imperial Interdictor. It is made of plastic, cardboard and, as always, of things you can easily find at home (beads for the bridge deflector, caps from dishes-cleaner bottle for the main engine thrusts and pill cover for the secondary engine thrusts).
The superstructure is completely new - to fit with the look in the comic book and in the pictures by Ansel Hsiao. As there are small differences in the look of the Interdictor based o the classic Star Destroyer, I took the best from all three variants I found. The gravitational spheres are made of small polystyrene spheres.
The Interdictor is in scale with my original Star Destroyer. You can see the construction in the last picture. The Interdictor is 10" (26 cm) long, almost 4" (9 cm) high and 6, 5" (16 cm) wide.