I already had a grasp of most of your response, but the earlier "bend vs. reflector" controversy left me with the gut feeling that I might be missing a piece of the puzzle. The physics about reflector size and distance from the source in relation to wavelength were new to me.

Based upon your input, I'm considering a combination of both: flat reflectors close to the driver for the first 90 degrees of the W-bin, and rounded bends to make the other 90 degrees toward the mouth.

If anyone's curious, I could provide some general descriptions of the 3 projects I have in mind. Two are currently on paper, shy of finishing minutia. When I feel like they're all presentable, then they will be posted for the general use of the forum members. That is, IF they're worth modifying or building! Or, maybe just a hearty chuckle....