I'm doing the same thing(putting together pieces from different years).
A word of advice, pay attention to the differences in years. Some years had shorter/longer parts that are not as easily interchangeable, or not interchangeable at all. For example the rear axle was shorter on the earlier years, and longer in the latter years. Front engine mounts we're different sizes as well, and fork sizes too. Some are easy fixes or could use different parts form other bikes. Like the front end could be used from a bike that has a larger neck stem, as long as you get the right bearing size to fit it.