Flank Engineer

 is a Tier 5 Tank that upgrades from Flank Builder, Arsenal Guard and Constructor at level 60.

Design
The has the same slightly-elongated Basic barrel in front as Trap Guard, but has its rear trapper replaced with an Engineer barrel. This barrel looks identical to the one found on Engineer itself.

Technical
As typical for the Flank Builder branch, the 's pillboxes fly forwards to the mouse, not to the equivalent distance behind.

As the

 * Since your blocks go forward, you can treat this as a version of Litterer with stronger bullets but delayed blocks.