You'll want an
ADL to make sure you can find some good cover. You may as bring some grots and a quadgun as well.
Kannons will want all the crew, all the ammo runts and the runtherdz. This makes them better at shooting, harder to kill and less likely to run.
Slugga boys? Shootas are what thing you'll want, you could drop this squad for the stuff above that costs the same.
Good list
This is pretty much my 5th edition, I have reasonable experience playing it in 6th. You'll probably need some better way to go out and grab objectives. Foot slogging boyz are not hardy enough anymore.