I just tried downloading the STL files from the original post and they downloaded just fine, not sure what the issue is unless you're maybe using the wrong link?
Also, when I mentioned a "Simplified" version, I just meant that since I'm planning to use it for mostly digital animation use instead of printing use, it wouldn't need any modeled supports. On a similar note, is there perhaps a digital version of the model that's already "constructed"? The STL files as far as I can tell are all modeled as sets of pieces that would be put together like a kit. As much as I'd love to reassemble the bits on my own time, if there's already a model that saves me that time and effort, I'd be more interested in using that.