Generally, softening those edges would prevent vortex formation in cross-wind conditions, but that edge is so short the effect would be minimal. The rule-of-thumb for leading edges is 4% of the gross width.
However, a glued or welded edge in a clear material might get away from you. Can the three pieces be cut out of a 4x8 sheet without rotating one? If so, I'd consider
https://www.google.com/search?q=bend...with+heat+tape.