Yeah it is an Oz robot.
I won't bother saying too much about brushless drive as I have no experience with it myself. A bit of advice I would give is that it is probably a good idea to have a brushed setup ready to go so you could just sub that in if the brushless has problems or fails during a comp.
Also think about how exactly you mean to put down the power from the motors... Its not really any good having uberpower if you can't use it. Its all very nice to play with big numbers but they tend to get a lot smaller when reality happens.
I wish you luck with the build though Might want to rethink the frame though, some tougher plastic or maybe steel or aluminium. Of course, I'm in no way experienced enough to really advise or anything, I just thought I'd add something I felt relevant.