Request for new primitives

[Mark Kennedy]

If a part would need such a rotated box2-5 with two triangles at the ends, then a part author could create it.

However, the part in question would not be able to use this proposed primitive, but rather stick with the existing box2-5 since the needed surfaces are not at 45 degree angles.

That is what the new primitive is for, not the box2-5 primitive.
the line:
1 16 -6 12 -26 0 12 0 4 0 0 0 0 4 tri4p2.dat
would replace the line:
1 16 0 14 -24 -6 0 0 0 -2 0 0 0 -2 box2-5.dat