You will need also

https://github.com/OskarLinde/scad-utils
https://github.com/OskarLinde/scad-utils

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That is easier said than done, but the frame has an irregular shape. I could,
of course use this module http://www.thingiverse.com/thing:210099 for the
extrusion but I need all the grid's elements to have a specific bevel and 3D
orientation. I guess the whole job is harder than I thought, though, for a
core 2 duo cpu. Probably an i7 would do just fine.

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Rendering Polygon Mesh using CGAL...
WARNING: CGAL Evaluator: Root node didn't fit into cache
PolySets in cache: 9
PolySet cache size in bytes: 221448
CGAL Polyhedrons in cache: 597
CGAL cache size in bytes: 104854928
Top level object is a 3D object:
Simple:        yes
Vertices:  175957
Halfedges:  529502
Edges:      264751
Halffacets: 191240
Facets:      95620
Volumes:      3420
Total rendering time: 20 hours, 48 minutes, 39 seconds
Rendering finished.

In reality, it took 3 times that much as it says.
http://forum.openscad.org/file/n17004/scad.jpg

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//bevel

use <bevel_extrude.scad>

module grila() {
union() {
//grid
translate ([0,0,0]){
bevel_extrude(height=10,bevel_depth=6,$fn=16)import("rama_pct.dxf");
}

//horizontal
translate ([0,0,0]){
bevel_extrude(height=10,bevel_depth=6,$fn=16)import("rama_oriz_1.dxf");
}

translate ([0,0,0]){
bevel_extrude(height=10,bevel_depth=6,$fn=16)import("rama_oriz_2.dxf");
}

translate ([0,0,0]){
bevel_extrude(height=10,bevel_depth=6,$fn=16)import("rama_oriz_3.dxf");
}

translate ([0,0,0]){
bevel_extrude(height=10,bevel_depth=6,$fn=16)import("rama_oriz_4.dxf");
}

translate ([0,0,0]){
bevel_extrude(height=10,bevel_depth=6,$fn=16)import("rama_oriz_5.dxf");
}

//vertical
translate ([0,0,0]){
linear_extrude(height=3)
import("rama_vert.dxf");
}
}
}

grila();

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https://drive.google.com/open?id=0BxF2sz0RGuRSejlvanZWNS1tTUk
https://drive.google.com/open?id=0BxF2sz0RGuRSejlvanZWNS1tTUk

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Thank you for that. I agree that my suggestion of using sweep is hard, if not
impossible, to implement if your sections come from dxf files like this one.
To adopt sweep you will need the 2D shapes expressed as a list of points and
there is no way in the language, and this is an unfortunate missing feature
of OpenSCAD, to access the points of dxf files.

If you are able to generate the list of points of your dxf files I am sure
you would have a huge time gain by using sweep to get your intent. The
chamfer in the bars would not be an obstacle to the sweep approach.

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to convert dxf files to polygon lists is easily done in inkscape using this
plugin.

• http://www.thingiverse.com/thing:1065500
  Inside the resulting file are variables conataining the polygon vertices.

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