Steampunk

 is a Tier 5 Tank that upgrades from Dual Builder, Tri-Builder, Composer and Auto-Tank at level 60.

Design
The has four small Builder-like cannons that are oriented 90 degrees apart. They are slightly misaligned with the cursor, with the whole tank rotated about 45 degrees so that none of them are facing directly forward.

Technical
All of the Steampunk's blocks go directly to the mouse position. The tank also has the Single branch's zooming ability.

Trivia

 * It is not known why this tank upgrades from Auto-Tank, other than the vague similarity of both having four main weapons.