A early UNAF prototype Titan chassis aimed at providing rapid mechanized assault with a strong focus on speed as well as close-quarter capabilities. The design was quickly scrapped as no power-plant at the time could provide sufficient power to operate the lower-body and maneuverability was very poor in cluttered urban environments. Only 2 units were constructed for testing purposes before the termination of the project.
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I was working on a four-legged walker tank, and after building the basic chassis, I had a random idea of putting the Challenger torso component on top of it in place of the turret. After I did that, it reminded me a LOT of the Provisional Unit 05 from the Rebuild of Evangelion movie. So I put on the Eva-esque shoulder armor I built 2 years ago, and modeled a big lance fore-arm attachment, making this the most impractical and pointless mecha I've built. Hopefully the actual tank will look better.