I'm not too enamored with some of the vehicles that have come out under the 30K version of Warhammer 40K, but the Legio Custodes tanks were fresh and different enough that I decided to give them a shot in 6mm scale. I humbly present the Legion Custodians anti-grav tanks.
Claudius Anti-Grav Main Battle Tank
Perses Light Anti-Grav Tank
Corona Anti-Grav APC
I'm going to try Sketchup'ing the jetbikes, too, but those might be trickier because I would also have to model the drivers, and I'm not sure I have the skill to do that. Still, we'll see.