07-08-2021, 01:50 PM
My stab at it: 
You managed to get a SVG for Gimp ? If the source is DFX then get a SVG via Inkscape.
The SVG I got from LibreCAD had multiple paths coming from the poly-lines I used. You might want to merge multiple paths into one. Up to you.
Looking at the standard Gimp brushes, I think the best bet is Acrylic 05, a big brush, size it to suit the Gimp canvas.
some screenshots: https://i.imgur.com/Yn4Q8UJ.jpg
Then stroke the path using the painttool option. I went one step further and distressed the line(s) using the Median Blur filter. Experiment with settings depending on image size.
more screenshots: https://i.imgur.com/z4szUHu.jpg
Never going to be wonderful, all straight lines from the CAD . You might be able to distort a little with a distortion map, Making one of those again depends on the image.
You managed to get a SVG for Gimp ? If the source is DFX then get a SVG via Inkscape.The SVG I got from LibreCAD had multiple paths coming from the poly-lines I used. You might want to merge multiple paths into one. Up to you.
Looking at the standard Gimp brushes, I think the best bet is Acrylic 05, a big brush, size it to suit the Gimp canvas.
some screenshots: https://i.imgur.com/Yn4Q8UJ.jpg
Then stroke the path using the painttool option. I went one step further and distressed the line(s) using the Median Blur filter. Experiment with settings depending on image size.
more screenshots: https://i.imgur.com/z4szUHu.jpg
Never going to be wonderful, all straight lines from the CAD . You might be able to distort a little with a distortion map, Making one of those again depends on the image.