This is the ST-1 Battlewalker from the game War Thunder. More information about it can be found the on wiki here: https://wiki.warthunder.com/ST-1
I originally built this just after the event but never posted it here, I recently when back to the design and improved a few things that I wasn't 100% happy with so I'm posting it now.
The .io file, instructions and parts list can be downloaded from bricksafe here: https://www.bricksafe.com/pages/apemax/st-1-battlewalker