I'm building my frames for next year, which will be my first year beekeeping. Looking at the plans on places like Beesource, it seems like it's more complicated than necessary. The sidebar top and bottom dadoes, for example, don't have to be different sizes. They just have to match the top and bottom bars. So my openings on both ends are 3/4 x 1/2 inches.
My bottom bar is a simple board with a dado down the length to accept foundation. The top bar is where my question is at. It seems to me that the top could just be a 3/4 x 3/4 bar with the tabs cut out so it sets correctly in the boxes. Most plans have it wider with notches added to accommodate the sidebars.
Is there any downside to having an overall thinner top bar in a Langstroth frame? Spacing is determined by the sidebars, so I can't think of any resulting issues.