The idea to design a new mech that fit better with the environment than their existing mechs appealed to Ves very much. He restrained his design tendencies for so long while he worked with the Vandals that he'd almost forgotten his true purpose!
While the brief opportunities he gained in the past to design a competition mech satisfied his thirst for a bit, it was like a single drop of water in a vast desert. Now that he found a chance, he didn't intend to let go.
Previously, the Flagrant Vandals already possessed an abundant amount of suitable mechs for the jobs at hand. While they made use of fairly random Vesian mechs they stole from their raids, the Vandals weren't entirely stupid and they prioritized older but serviceable military-grade mechs.
None of the designs that Ves could come up with could outperform these optimized mechs, even if he incorporated military-grade component design schematics.