I am a railway modeller, I can design and add basic textures in SketchUp, no problems.

I needed to up the texture levels [quellenform instructions][1] put me right so now Walls with real life textures are possible.
I made a couple of how too videos aimed at the newbie like myself on [my YouTube Channel][2]. I am trying to pass on the knowledge and the response was great.

[![Test piece][3]][3]

My question is: how do I convert a SVG/STL/DAE type file in Blender to a single mesh with no subdivisions so I can add a displacement texture. I can then cut out windows using the Boolean method later once the texture is applied. I have Construction lines addon installed, would this help?

[![Type of drawing I want to convert][4]][4]

Import SVG, Limited dissolve works well.
I try and subdivide and only the edge gets subdivided?

[![SVG imported][5]][5]

[![Limited dissolve][6]][6]

[![Subdivided only edges affected][7]][7]


I seem to be doing something wrong as I get to the REMESH stage and when I apply it the CPU slows down and the object disappears.
[<img src="https://blend-exchange.com/embedImage.png?bid=907yNMs3" />](https://blend-exchange.com/b/907yNMs3/)
[![DAE file from SketchUp][8]][8]
[![Original geometry][9]][9]
[![Removed all internal geometry][10]][10]
[![Edit mode add face F_KEY][11]][11]
[![Solidify][12]][12]
[![Remesh][13]][13]


I thank you very much for the time spent educating a numpty like me.
I have been going through the node sequence box by box trying to work out what does what.
I have come unstuck on the first hurdle. On the Map Texture Scaling Box the blue box Map Range node has no node connectors. How do I connect that box to the Bounding Box node and Position node?
[![enter image description here][14]][14]


  [1]: https://blender.stackexchange.com/questions/262934/cutting-a-hole-in-a-wall-with-displaced-texture
  [2]: https://www.youtube.com/watch?v=w7I8ax1KWjg&list=PL2Mz1GBib5AsbP06-fgANDgQS0Ehhy90S
  [3]: https://i.sstatic.net/4PwjI.jpg
  [4]: https://i.sstatic.net/cskre.png
  [5]: https://i.sstatic.net/V2k5v.png
  [6]: https://i.sstatic.net/SwF9H.png
  [7]: https://i.sstatic.net/o2YXy.png
  [8]: https://i.sstatic.net/sCiWD.png
  [9]: https://i.sstatic.net/z2pNc.png
  [10]: https://i.sstatic.net/YAUiE.png
  [11]: https://i.sstatic.net/hFS96.png
  [12]: https://i.sstatic.net/mQ6nL.png
  [13]: https://i.sstatic.net/pLkgx.png
  [14]: https://i.sstatic.net/Q8JeJ.png