Nop-03 Sarubia

This model is the Nop-03 Sarubia, a tank that fires a rolling ball bomb against you in the game Metal Slug. This is the first bad guy instructions I've made from that game and it is one of the more recognisable ones. 

You can actually fit one minifigure at the back opening of the tank. 

This MOC does use a combination of Lego bricks and Brickmania track links, which you will have to purchase separately to complete this look. 

There MOC uses 1.5 track links and 1x pack is all you need to get:

https://www.brickmania.com/brickmania-track-links-chevron-one-and-a-half-wide-steel-x150/