Senkaishu's Gunbot and Missilebot were linked by their Overclock ability, and when we had a couple of higher tier units slated to join the lineup I knew I wanted to keep them consistent design-wise.
I tried a few different options but settled on the weapon types indicating attack modes (double gat = twice as scary as the base gunbot, gun and missile pods = attacks both planes) and bipedal chassis to imply slightly more advanced manufacturing compared to the four-legged Core units.
Final models by Nic Reid
https://www.artstation.com/artwork/wrKln9