Dennis,
Not trying to argue. I am familiar with several of Don Bambrick's airplanes when I was in Dayton during the early 70's. If he had a model he called the Aquilla, it is unfortunate that there is not an article on it, at least I have nothing in my records that showed he published such a design or if there were any pictures published.
Nevertheless, Bob McDonald did have his Aquila (spelling from his article) published in Flying Models as explained above. Bob's Aquila was (or is?) a very attractive model, finished to his normal high standard and was (or is?) a good performing ship.
If there was another design by this name or some derivative of it in or around DC anwhere in that era, there is nothing in the magazines (at least in my files) in terms of photos, articles, or stories.