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J tube stove for the rocket oven

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So I found a fairly local supplier for ceramic fiber board and mineral wool but before I called them I was going to see if all you folks could give me an idea of what I should be asking for?

For the ceramic fiber board, do I want the 1/2 inch or the one inch? And the 2300 deg or 2600 deg F or something else?  

We are also planning to build a rocket mass heater next summer so I'd like to get some ceramic fiber board for that as well. Any recommendations on that? We'd be building an 8" system if that makes a difference and we've got Erica and Ernie's book to use for guiding us as well as the 4 DVD set (although I haven't watched the DVDs yet).

They also sell firebricks there. Is there a standard dimension on those too?

Also for the mineral wool. Does it come in different ratings and thicknesses as well and if so what should I be asking for?

Sorry for all the questions !

And thanks in advance for your help.

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Location: Moved from south central WI to Portland, OR
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I'm not an expert, but I have a rocket oven, so I'll tell you what I saw go into it.  
(I have the one that Tyler Morrison made in the video! You can watch my painfully slow process in finishing it here! https://permies.com/t/90413/quest-beautiful-rocket-oven#748081 )

You want the one inch ceramic fiber board, and I think that's the higher temp rating as well.  The rocket oven takes 1.5 sheets, so I'd say if you're going to make two rockety things you should buy 3 sheets.  If you go here: http://walkerstoves.com/index.html and scroll down, you'll see the J-tube plan that is used in the rocket oven video.

Have you got access to the microdocumentary here? https://permies.com/t/rocket-ovens  I recommend watching, because Tyler talks about tools and materials you need to build a rocket oven.

The firebricks in my rocket oven are half thickness and used as an inside liner for where the wood goes in.  I think the sizing is pretty standard on those - there are half thickness and full thickness fire bricks.

Mineral wool, or rock wool, is used for attic insulation and every time I've seen it it's been the same thickness.
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