Warhammer 40k Terminator Assault Cannon

I made this to go with my previous terminator model, which I am improving the textures and planning to repost when I have several weapon choices to make a full squad.

The reference I looked at is a custom Thousand Sons Cataphractii Terminator Mini, I just thought the belt-fed version with an ammo backpack is unique compared to the official models with the ammo box attached to the cannon.