The Metal Slug Super Vehicle tank was made from an Imaginext Robot Police Tank by Fisher Price. It had lights and blue robot arms but those were removed, filled in with Apoxie Sculpt, and smoothed over. It's easy to unscrew and open up to part out for painting. I created a domed top, scratch-built the side machine guns from abs tubing and Glyos parts, used a Hero Factory chest for the back chassis system. On that system are the exhaust made from Sigma 6 Duke wind-up gun barrels and ML Heroes Reborn Iron Man pipes and random parts for the twin tubes and antenna.
The working light on top is a Neo Shifters light-up head with a custom case built around it, fodder parts for the roof vent, sculpted 3-hole side vents from Apoxie sculpt, added Spawn Interlink feet jets for the 4 side pegs, and various fodder parts or Modeling Support Goods hobby parts for detail.
The tank's main cannon blast was a mix of an Avatar Fire nation accessory and ML Centurion Iron Man missile tip. The side cannon blasts are ML War Machine feet blasts. Basecoat on the tank is Tamiya spray lacquer Lin Grey (it'll take a whole can, about $6) and then hand-detailed with various Testors Model Master Acrylic and Formula p3 paints. The tank makes sounds when you press the button on the main cannon and rolls on hidden wheels.