That looks really similar to our design.
We are only using 4 CIMs on the drive and are wheels are at 45 degree angles to the direction of normal travel(
Picture). Omni drives like this actually travel faster in that orientation in the orthogonal directions (They travel faster then each individual wheel velocity)
Source
Our lift is using spectra cord instead of timing belt but overall an extremely similar robot design. I hope we both do well in competition.