Cleavelands edge rolling tool works great, but it must be mastered. Good sheet metal techniques take many hours (really years) to perfect, If you want to know what I mean look at one of those hand crafted all aluminum wheel pants and cowl. Those artist's use a shot bag, hammer and English wheel to stretch, shrink and form metal like you wouldn't believe.
All lap joints benefit from a slight edge bend, honest guys, if done right it is a water tight fit...wanna get really creative? Hone down the underside to mate with the lower skin and seal the top to the bottom. It's a matter of how nice do you want the finished product to look...and what your level of craftsmanship and acceptable (to you!) finished product are.
Not saying anyone is a hack...but really how fast do you want to get done and in the air? Makes a difference in your decision to say "good enough"
My RV-10 is several hundred builder numbers behind many of the flying ones, because I for example, honed the top overlapping skin to match the underlying bottom skin, among many other things that took time, won't affect performance but I felt impacted appearance.
I fall off both sides of the fence and usually end up on the appearance side, as long as it doesn't jeapordize structural integrity, then the fly side...YMMV.. just depends on what's the most important aspect to you.