Today's classic Marx spaceship is the 32 with twin fuselages. The twin fuselage design, although odd, was not unheard of in the real world. During World War II the Germans used a dual Heinkel He-111Z as a glider tug and America had the twin fuselage Mustang designated the F-82 and there have been others throughout history prior to when Marx came out with this design. The ship measures 4 3/4" (12.1cm) L x 4 7/8" (12.4cm) wingspan. Enjoy!
Here the twin fuselage ship is teamed up with a Premier Plastics Flash Gordon space ship for size comparison