Alignment of Semi-Major Axis of Orbits
The major axes of the planets are not aligned.

The major axis passes through the perihelion, the solar system barycentre and the aphelion. So by looking up the Longitude of perihelion we can find the direction of the major axis:

planet  Longitude of perihelion 
M       77
V       132
E       103
M       -24
J       15
S       93
U       171
N       45


There is no evidence of alignment.