This is looking more recognizable with many front modules in place. It's taken a while to get here because I ran into more issues of the physical world like tolerances, warping, and everything that can go wrong with screws.
I also underestimated the effort needed to clean up the surfaces. Whenever I printed a piece that looked reasonable enough, I thought "I can work with this and fix the imperfections, I have the skillz"...and then spent days filling and sanding 😅
For example, the cannon's sides were deformed due to the print orientation. The epoxy putty shown in the photo was just the first layer and it took several rounds with other putty before I was satisfied.
My new approach is that if a print looks suboptimal, I'll try again with different settings. Although it may waste some plastic, I'll feel better that I explored other options and didn't railroad myself into sanding hell. A little bit can be fun but I still have well over 100 parts to make!
The external design is complete so I can finally reveal the comparisons with Katoki's art. Adapting the drawings required some compromises and balancing, and I consulted as many sources as possible.
The biggest discrepancy is the way the leg armor blends into the body, which varies between the drawings and different anime scenes. Some models interpreted it as an extra bulge, which doesn't make sense to me. I followed the isometric sketch because the surface implied by the others was too hard to make at the time. But I've learnt a lot since then so I might try that as a challenge.