Line art? What do I need line art for? When planning out a custom colour scheme for your build the best way to plan is to take some line art and go to town with an image editor. Take a clean piece of line art, select some colours, and have fun with the fill tool. It’s a great way to get a general sense of what colour combinations look good, and depending on the detail level of the kit/line art, even plan for what pieces get what colour.
I want to call out that I didn’t make any of this line art. Well, some point in the past I’ve cleaned some up, but I couldn’t tell you what I did or when. In general it’s been a group sourced thing going back over a decade. Gunpla fans from all backgrounds have contributed toward this collection. At some point there was a Japanese Seeaa wiki page that had pretty much everything but that disappeared a few years back. What’s listed below is the combination of the collection I’ve saved up, plus others who’ve been archiving images like LightningBW, Gundaml1neart, and Tomo Wise (that’s a NSFW link btw). Some folks have labeled their additions over the years, and where possible I’ve made sure to use those.