OK~ First off, the best part of stringing is that you can do whatever you want...THAT being said, what it the size/structural difference between sidewall lace and cross lace? Also, I still have an old roll of "Top Lace" that I still use but it looks like more people have moved away from using a thick string for the top...maybe because heads are now designed to protect the top string? Or no one plays in parking lots because it's 1986 and your school doesn't have a lacrosse field?
makes their own string, maybe a lesson in nuances of laces is in order! ;)