The black lines you see are the surface outlines - switch 3D->surfaces off.
Perhaps make this from an Object->revolve of a line? The line would be made from equally spaced vertices. That way you it will perfectly spaced radial shape.
If you need a grid over your panel, make another line slighty further waway before you revolve both lines. This will create surfaces but you could set the surface-type to line afterwards. Alternatively, use the surfaces but make holes in them.
If you want to use the existing object you show here, select strips of vertices and use move-to to set them at specific distances (press the > before changing one dimension, so you only move along one axis).
Andy
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