You basically have it right. The 1/48th Italeri kit is the same as the 1/35 Panda come Dragon kit. It is the kit that was up-sized to 1/35, so the errors are the same. It is an H model, not a D on the box top. Either version can be made from the kit though, using the right pieces. I don't know how accurate the markings are for the type of helo depicted though.
For a Vietnam H model, the long antenna on the roof is a post-Vietnam FM antenna, so leave it off. The wire antenna down the tail boom was an earlier model and was used in Vietnam. It was mainly seen on command birds with extra radios inside.
The rotor blade in the kit is incorrect for either the D or H model, Bell-205, Huey. It is a Bell-212 (UH-1N) rotor blade. Here is how to fix it:
The middle blade is the straight 212 blade from the 1/35 kit. On the bottom blade, the red areas are the areas on the 212 blades that need to be removed to make them into 205 blades. The top blade has been reshaped into a 205 blade.
Hope that helps.
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