I'm using a 29" scale, and to keep things looking right, a 15 fret neck joint.
This leaves the bridge about 1.5cm further back on the body than normal on a 000, to compensate for this I shifted the X a little, but added a large, slightly thicker than normal bridge plate to transfer the string tension stress to the X's a little better. Other than that it's normal 000 like my last (with the wing/block arrangment at the neck end like before)
Side thickness was about normal (2.7mm) but I thinned them a little at the wastes to avoid cracking in the flame.