ok, looks like you have the makings of a good horde army right now, but you're missing some key components.
Rule number one for playing orks: You do not take toyz before boyz.
Rule number two for playing orks: You do not take toyz before boyz!
Ok, fight club references aside, boyz before toyz is the most important thing to keep in mind. Quantity is a quality in its own right and Orks are the very best at quantity. You can skip out on a lot of the shiny bits, like flash gits or 'ard boyz or even tanks for more boyz. In a horde list your troops choices should be filled or almost filled with large squads of boyz. I usually take squads of 25 at least with my boyz. Every squad should have a Nob with a Power Klaw, the hidden power klaw will live long enough to kill IC's, vehicles, and Termi equivalents.
You also have the makings of a very effective Ork build called the Kan Wall. The idea for the Kan wall is to have something like 3 squads of 3 kans or 5 deffdreds in front of your horde with 2 Big Meks with KFF's. The KFF's will obscure the Kans or dreds giving them a 4+ cover save, then the kans will provide cover for the orks behind them giving them a 4+ cover save as well.