The bottom of the corner is made up of two pieces of ash forming a huge lap joint. We used the router to cut away the bottom of half of the eight ash pieces. About a third of the board was removed.
Here it is, upside down. The lap matches the tongue. So to speak.
The other half of the joint has the top removed.
Like so. This one is rightside up.
Just placed together, it's OK, but it needed my dad to finish it up with a bit of planing and chiseling. And just a tad of tablesawing, to adjust the edge.
All the bottom pieces. Bottom halves on the left, upside down; top halves on the right, rightside up.
The lap joint is glued. The bar clamps hold it square, and the C-clamps hold the glued faces together.
The result.
All together now. The tongue on the outside of the ash bottom fits into the groove on the inside of the walnut sides.
There will be walnut caps on the end of the ash, to fill in the remaining space.
All four - inside and outside.
That's all for now!