Trukk heavy lists seem like they would be pretty hilarious to play, I have a few suggestions though..
Wazdakka without a bike squad with him will get horribly maimed before he has a chance to earn his points back, I would say either invest in a bike squad or since its a trukk heavy list get a 2nd
KFF.
I dont like Meganobz honestly, they are so expensive and since your focused on getting a 2nd turn assualt they are to damn slow. Trukks have 10 armor, one squad of marines with bolters can leave your 2 squads of Meganobz (260 points) cupping their balls for the whole game while they waddle to the other end of the board. If you like Meganobz get them a Battle Wagon with Deffrolla and put one of your
KFF guys in it, it will stick with your speed assualt (and squish) theme while keeping them as safe as ork transport gets. I personally would rather go with 2 regular Nob choices all decked out with a Painboy and using them to get 2 dedicated battlewagons with Deffrollaz.
Red Paint on your trukks man! If you want Turn 2 assualt that bonus inch can mean wether you get it or not!
I like your idea for using your stormboyz but i personally would run Zagstrukk. for 85 points you get a Nob with better
WS, +1 Wound, autopass
BP, Deepstrike, and hmm...oh thats right INITIATIVE
PK ON THE CHARGE. You get that
PK bonus EVERY time you assualt the enemy. Plus deepstriking them sounds like a lot of fun too!