In this project I've used a lot of overlapping UVs. It worked this time, but I need to be more careful in future. The obvious advantage of this technique is UV space saving, on the other hand there are 2 minuses, 1- loss of variation (doesn't really matter for parts that not suppose to draw attention) 2- lots of seams, works especially bad with UDK.
Example of how UVed smaller wheels that almost not going to be seen.
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