Get a minimum of 60 boyz, then I'd look at bringing the Stormboyz up to 15 strong and adding Zagstruk, because he's all kinds of hilarious. Oh, and 10 more Lootaz at least.
I agree with this, although I wouldn't use Zagstruk, a nob with a powerklaw and bosspole would be better for them, in my opinion.
Also, at least 2 more bikes. The bikes need to be 5-6 in size with a nob, powerklaw, and bosspole.
In fact, virtually every Ork unit needs a nob, powerklaw and bosspole (and maybe 'eavy armor for the nob as well, if you have the spare points) if they can take them.
I wouldn't use the weirdboy, they don't really work well at all with 6th edition rules. Just use the model as a really cool runtherder or painboy instead.
Finally, if you can get your hands on some cheap heavy weapons bits, putting together some converted big gunz kannons would help a lot too. A unit of 3 kannons with 3 extra krew is only 69 points. Ridiculously cheap considering how effective they can be.