I can tell after assembling the first booskelf that bowing would be an issue in the future. The largest shelf, which is on the bottom sits 3" above the floor so I can trim it out.
I'm definitely going to reinforce it from underneath before installing in order to prevent flex. As for the upper shelves, which will do lighter duty, I may add some face framing in order to stiffen them, but they are also getting a 1/4" backing on each unit.
On a side note, do you guys typically vave to make a second pass with the router in order to get the full width of the dado?
In other words, with a 1/2" bit (The plywood is right on 1/2"), after the initial pass, even after cleanup sanding, the fit of the dado is extremely tight, but with a light second pass where i can hear the bit still lightly trimming, the fit is a nice snap it that seems right on.
If it works why worry about it, but it seems to fly in the face of logic that the same bit on the same track with widen the cut. Am I crazy?