Ghost there is a Forge World warboss on a warbike that many people use as Wazdakka Gutsmek. As long as I'm thinking of the correct guy. He's a bit pricey but looks great (from pictures at least)! But if your looking for a cheaper alternative just add some extra bits onto a regular biker or something you can always get creative.

As to your other question i believe that his special ability allows you to take as many biker squads as you want. But i hope some one will also confirm this as I am far from an expert on the rules. Hope i helped and good luck to your buddy in starting his Ork biker Waaagh :beer:

 

You're right shabang, Wazdakka allows you to take as many biker squads as troops as the force organization chart allows (2-6).

 

If you look online there are some conversions. This one is from an old GW article.

Ork Armies of The Studio: Page 4 | Ork Articles | Armies of Warhammer 40,000 Articles | Games Workshop

 

Tell you what, I like the four-klawed Deff Dread as well. Gives me an idea for my converted space marine dreadnought...
As for Wazdakka, I agree with the others, you could get the Warboss on bike from Forgeworld, or convert a normal biker, perhaps by giving him a different head, an arm from the Warboss kit, and adding more dakka onto the frame like some KMBs from the lootas/burnas kit, some big shootas or even a rokkit launcha or two.

 

Yes...four clawed Dredd FTW heh...