So I made this panel with breadboard ends:
I learned eventually that I jumped the gun and may have made a serious mistake. When I assembled this, I glued only the middle portion of the tennon, as I was supposed to. However, I added the dowels AFTER the ends were glued on, and at that point I hadn't pre-drilled any dowel holes. So the problem... Is that the tenon doesn't have elongated holes for the outer dowels (the center ones are fine).
Am I destined to run into issues? Will this likely end up with several big cracks if the wood expands or shrinks? My options are:
1) Leave it alone and hope to hell it never happens. The risk is having to remake the entire lid.
2) Drill out the outer dowels, and insert a dowel that has the middle section, corresponding to the tenon, thinned out a bit to allow for movement. Or just drill out all of the material within the tenon and put a very short plug in that doesn't reach the tenon at all. The only risk here is if I Don't line up the hole perfectly, those dowels might look a bit oblong.
The dimensions are 18.75" x 38.6".
I made the BB ends as a sprung joint, so the outer dowels aren't really even needed other than for decorative purposes.