Thickness using edges

When I try to create true cylindrical roundness to metal frames I am creating, I have created box-like structures with crossbars using edges. Even when creating them in 2D, when I add thickness to the edges, the interior crossbar cross sections seem to be elliptical, deeper on one axis than the other. Anyone else experience this and/or have a solution?

Thanks in advance,
Don Kennedy

Whar are the scale parameters of your object? If they are not all the same you will get stretching.