I absolutely love what you've done.
First thing I noticed was that while staying true to the 'feel' of Factorio you've managed to up the diesel-punk feel a notch. Secondly, the variations in the 'working' of each is much greater than vanilla, and easy to notice that there are difference.
I look forward to seeing a factory of these mixed with the elevated rail supports. The shape seems perfect for mixing the two together.
The destruction animations are great work, and such a shame since I expect to see it very seldom. Other than the early, pre-bot, part of the game I don't watch the reworking of the factory for upgrades. Just set the orders and let the drones work while I'm doing other things.
I'll be happy to see any other reskins you do. I wonder if you could save yourself some time in blender by doing a bit less with the animations. Of course, now that you've set the high-bar, reduced animations might not be acceptable to others. :shrug:

Excellent work.

Thanks for the detailed feedback, I really appreciate it. I'm happy the diesel-punk feel comes across as it was part of the vision as well as a lil steam-punk thrown in. I started with the tier 3 machine and worked down the tiers trying to differentiate them without straying too far by keeping at least one component consistent. Animations wise I think it was more about challenging myself in an attempt to improve my blender skills, it is a shame the destruction will have little screen time but sometimes the extra detail can make it feel more polished as a whole.
Its great to hear you enjoy the changes, it was a lil scary to reskin such a iconic asset as not everyone likes change.