I can't use the original textures without redrawing all the bounding edges. Here's a link to a model which contains both the original model (on the left) and the simplified model (not quite complete yet) on the right.
I viewed the original face-on in parallel projection from front, sides and top, and in each view screen grabbed what was visible, saved the texture from each view, then imported and applied them to much simpler boxes on the right.
I did it first in two separate models - in retrospect, perhaps a mistake?
I have drastically reduced the edge and face count:
Original - 5300 edges, 1800 faces (in round numbers)
Simplified - 81 edges, 35 faces.
But the textures have ballooned the file size (when separated) from 950KB to 3.6MB in the simplified model.
I think I viewed the original at too high a zoom level when taking the screen grabs. I'll try it again tomorrow, not so much zoomed in on the original when sampling.
PS. This is just one component of hundreds that have been imported, all too complex. So there are lots to try to simplify.
The resulting overall model has over 13 million edges, over 5 million faces, and a file size of around 245MB. Even with lots of layers turned off, and modelling in Monochrome, the model is painfully slow to edit, orbit or zoom. So I'm trying to help the originator by simplifying as many components as I can - this is the first I've worked on.