Help with a stable 3D box solution

I'd like to make 8 points in 3D space relatively stable. I would use this as a simple 3D box physics base...

Any basic-like simple links or code will be really appreciated! :)

For a box, i'd say you're best off with connecting all points to all other points.

With some success, I have also used the original x,y,z, and keept pulling them back to that place, as a snap transition, or by adding the displcement vector into the forces list. It should be faster than forces.