Here are some paper models from the Japanese Honda website. They are in a different style than the Nissan models but they're still cool I guess. They're much different (hand drawn and with models of buildings and stuff) Apparently Mizorogi-san is the one behind it.
I've searched Mitsubishi and Toyota and can't find paper models on their sites. Know what would be cool? BMW paper kits... Doubt you'd find that though.... I'm going to keep looking...
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