This is a piece I created some time ago...
It's a mix of SD Goku Impulse Gundam (specifically the Resurrection version) and HG God Burning Gundam.

As you can see, the God Burning Gundam is the base, and I used the Goku Impulse head.

I like both HG and SD, so I wanted to create a piece that utilized the best of both, and after much thought, this is what I came up with.

Personally, I see it more as a character (life form) with these proportions, rather than a mobile suit.

SDHG God Goku Impulse Gundam | ボア・ヘッド's Gunpla works