Finding any base for the color of the Astro-Viper v2 and that...color was gonna be a stretch...and since I HATE painting a figure head to toe...RET Kamakura became as close a match as I was gonna find.
The Raginspoon kit covers his ninja jammies decently and it may not be a 100% match in color but I think the overall look works. I added some gold and black paint.

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My Two Rule for Customs
Custom Rule #1: Honor the spirit of the character
Custom Rule #2: I'm not that great a customizer so keep it as simple as possible