For the top half of the machinery, I can again use Sides to gather the textures:
Half-body.jpg [ 637.97 KiB | Viewed 1499 times ]
And I would pretty much be done using any helper scripts at this point (Like Heal Selection).
The reason is that the foreground rocks on the left of the frame will make it hard to get a clean texture to finish removing the machine body...
So what I did at this point was to switch gears to a different method.
To the right of the machine in the rock field (roughly on the same plane as the machine lower body), I just selected a section of the ground and rocks, copied it, and pasted it into a new layer called "Base".
Then I selected what was left of the machine body on the image layer, and ran Resynthesize directly.
When the dialog comes up, there is an option to choose the Input Texture source. I chose the pasted layer "Base" as the input source, and checked all the options for output. Then I just hit OK.
Resynthesizer then rebuilds a texture to fill in my selection based on the texture source, which happens to be a clean bunch of rocks and texture from a different place in the image.
And finally, here's the result (with no other touchups at all):
Complete.jpg [ 647.97 KiB | Viewed 1499 times ]
Hopefully I'm making myself a little clearer this time around?