When reading publications you note two versions of the AD-1 model, primary strike and electronic warfare model AD-1Q. But when you take a look at the images you note variations in their look. First image show something what we can accept as standard AD-1. Next one have additional aerial on the top fuselage. Third drawings show difference in openings behind the engine as well spinner on propeller. Next one is almost standard but with very long bottom row of the engine exhaust. Next one are AD-1Q, you will note entrance door on the fuselage side as well some other changes from basic model. The next one is also AD-1Q but it have pito tube on the vertical tail like later versions as well repositioned aerial wire...
And I have just start with drawings and I thought that this will be easy work...