This is the LEGO Republic Fighter Tank 75182, modded by Zach, basically built out with extra guns and cool stuff. The four racked missiles in the front are new, as are the spotlights/sensors (borrowed I think from the Scuttler?) angling from the prongs. But the best additions for me are the pair of Troopers riding sideboard, a binocular viewing station portside rear, and–my favorite bit of bricolage–a weaponized turkey leg.
[UPDATED WITH CORRECTION: Zach informs me that what I called the “binocular viewing station” is in fact a rocket launcher. Also, the turkey leg is not a gun but is there for the Troopers to eat.]