Is it possible to change an ellips to equal segment lenghts?

Hi All

Have to work this weekend so sorry job questions, but do you know if you can break an ellipse in even lengths between vertex points?
The skull, the ellipse around the square has 600x400 granite groundstone, so can I change the ellipse to 600mm long line segments? The problem is that at a distance of about 30-40m a support wall will follow the outer shell, but the support wall segment is 1000mm long so that ellipse I want to change to 1m long line segment!
Why
Yes, because I want to copy the outer granite stone in parallel to find the ultimate space between the beginning and the end of the radius of the wall of support so that it does not end in or the worst breaks into the outer granite shell

\\Tom