Nice grab, Rei. The Rainbow Barom-1 guys are still some of the greatest and most bizarre toys you can get (thanks of course to the original incredibly creativity), but have sadly gone by the way-side in recent years; they really deserve more love and attention. I think anyone would be hard-pressed to pull out another toy with that kind of wonky craziness, and the best part is [for me] that they maintain all that fun and whimsy, and are still very clearly TOYS (unlike many 'gruesome' and 'art' sculpts being worked nowadays).
Of all the versions made by M1 of Mechagodzilla this is one of my favorites, I think it would be the closest thing to modern Hawaiian version.