That is starting to look like a fantastic KoS list, I am so happy that there is another speed freak among us, I personally invite you to join the Waagh. Just go to
THIS LINK and post a reply that you would like to join. You might as well join, as here you can earn teef and show to the world that you are not a poser.
Now on to your list.
For your truck boys I second the motion that you make most of your truck boys into shoota boys. Give the nob the big shoota as he can use it better getting those accurate hits that allow you to choose your victim.
For the burna boys, well you have it right, good stuff, and a great unit.
For your battle wagon pile on four big shootas, even moving cruising speed you can still snap fire the big shootas, and with 12 shots you will hit something, you can leave the stick bomb chuckas as they really wont help anything. Yes a unit can throw a grenade this edition, but I doubt that the low strength and short range of he stick bomb would be worth the points.
For the tank bustas boost their number to the full 15, and give the nob the bomb squigs. What this gives you is 14 shots every turn and with the nob using a bomb squig he can "shoot" for three turns of the game, albeit at a shorter range. Just as a side note in my battle yesterday my tank bustas shot down three dark eldar bombers, so they are good anti aircraft even with the snap firing. If you can squeeze in some points procure a second BW for the tank bustas.
For the looted wagon, a boom gun is always fun, not requiring ballistic skill to hit, and a pie plate to boot. Be sure to give it a few other weapons just in case the boom gun gets shot off.
I am finding the burna bomma to be more useful than the dakka jet. Sure the dakka jet comes on and kills a transport, but then it dies quick from all the other aircraft flying around or anti aircraft fire. The burna bomma comes on at full zoom and drops a bomb on some enemy unit and fires two burna missiles, the dakka guns and the big shootas, usually killing other stuff as well. Then flies off the board dropping its second bomb on the way. Then ongoing reserve it comes on and shoots missiles and guns again, then usually gets shot down. So far my dakka jet has survived only one game in about 20 or so games, while the burna bomma has a 50% survival rate, and does kill a lot of stuff. So I said all that to let you know that if you are investing in a plane I recommend the burna bomma over the dakka jet.
Just my two teef, hope that helps