Regions: how can I export the boundary and control their graphical display?

Using my freshly purchased Mathematica 10, I am constructing shapes using boolean operations of quite simple component regions: rectangles circles and polygones.
I wasn’t able to findout how I can display them in Graphics or similar contexts, as I can do with the simplest regions like Rectangles and Disks.
RegionPlot does not suit my needs.

Also, I am not able to export the results as DXF.

Any help is appreciated, thanks in adance. Find enclosed my tentatives, with comments.

Anto, a novice