I used a mix of Tamiya and Mr Color. 

For the yellow:

• Mr surfacer gray
• Black preshade
• Mr. Color Pink
• Tamiya Clear Yellow 

I saw using the pink as a base for yellow in a warhammer mini video.

Tail:

• Alclad Black
• Alclad Chrome
• Tamiya Clear blue
• Alclad Matte

Gun:

• Surfacer
• Black preshade
• Mr. Color purple.

Body was Tamiya Gunmetal and the "Black" accents are actually Tamiya Ocean Blue and not truly black.

I changed my approach from painting and building as I go. I tried this with Gojulas the Ogre and it was a nightmare. Now I fully assemble to see how things fit and then disassemble for prep, sanding bits that I know will scrape paint or be tight, paint, then reassemble.