On the left is a cross dowel installed, with a screw threaded into it.  In the middle is an uninstalled cross dowel, and on the right is the drill fixture I built to drill the holes in the edge of the part which the screw goes though on the way to the cross dowel.

Here is the hole being drilled.

Here is the joint assembled. Sill more finishing to do on the Baltic birch parts being joined.