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Do the two auto cannons come in each dreadnought box or do you have to get get them seperately?

There are no plastic autocannons in any space marine dreadnought sets.

You have to convert them, buy them from forge world or another third party website

Alright cheers bro

http://www.games-workshop.com/gws/catalog/productDetail.jsp?prodId=prod20006a

I bought this and it has 2 autocannons in it plus a bunch of cool terrain.
Only question I have is, when you get them out the auto cannon barrel is missing a side because the two connect when you put them on their platform. How would you fix that with liquid green stuff? Or would you just have to buy green stuff?

There are loads of manufacturers who make resin double Autocannons for "28mm Walkers".

I think PuppetsWar do one. Paulson Games too I think. It's worth looking around Tiarna, you'll be surprised what you can find.

From;

http://bitspudlo.com/products/flak-cannon-platform

Or go the cheapest route: use the lascannon and missile launcher arms on the normal dread kit you're not gonna use anyway. With a bit converting and some help from cheap army men plastic toys (make sure to buy ones with autocannons of the right size), you can get 'em psyfle dreads.

Cheers I'm gonna order the puppet war ones wish I'd heard of them before I'd wasted twice that amount on a cygor compared to the two they have

I made this conversion using the Aegis Defense line guns.
Here's the link to my tutorial on the process as well:
http://fromthewarp.blogspot.com/2010/03/mortis-pattern-dreadnought-conversion.html

I'll have to check some of these sites out.

I'm going to give this a try

http://www.shapeways.com/model/414990/

Are you going to make 3 Dreadnoughts? If so, it'd be prudent to get this:

http://www.games-workshop.com/gws/catalog/productDetail.jsp?catId=cat440312a&prodId=prod40002a

$15 more (USD) than the 3x Aegis Defense Lines, and you get 2 Bastions, which are $30 each by themselves.

Definitely a bargain.

Decided I'm going to splash out and get two relic contempt or dreads and the FW auto cannons

I bought two auto-cannons from Forge World. I believe they were only $10 a piece!