To add to Gino's treatise on the Dragon UH-1D/H, out of the box you basically have all the parts to build the most upgraded version of the Huey, the Huey II. The Huey II is actually a single engine Huey with a UH-1N (212) tail boom and rotor system.
The windshield also has holes in the top for the windshield wiper blades and some folks have found that objectionable. Also, although the PE is the correct layout for a UH-1H, the instrument panel backing and shroud are correct for the UH-1N but not the UH-1H. In the UH-1H the instrument panel is assymetrical but the N panel is not. Anyway, we're probably splitting hairs here and it is the only 1/35 long fuselage Huey kit around.
The Dragon kit is a scaled-up version of the 1/48 Italeri UH-1D/H kit, so you might check that one out if you have it to get an idea of the basic parts breakdown and such.
Ray