Making a rocket stove (versus a mass heater)

So I read the mother earth news article, bought and read Kiko's book, found some very helpful material online from Sigi Koko, bought these plans... and am still unsure about a few things. I grew up in suburbia and don't have the first idea about wood stoves. I plan to put a roof over my outdoor kitchen (including the oven) at some later date. For now I'll cover the oven with a tarp when it rains. What do I need to get the stove pipe through the roof? Let's assume it's a tin roof on a wooden support structure. I might have access to an old billboard vinyl, but expect that would be even more difficult to reconcile with the stove pipe. Can I buy an inexpensive 6" single-wall pipe to build in for now and cut it off and splice on something else later if I need to? Why are the double and triple wall stove pipes so expensive? would it be less expensive to use metal supports under the tin roofing? Would I still need to use special pipe through the roof?
If you actually see this and actually reply... can you also direct me to where I can learn about the critical components/dimentions of a rocket *STOVE*? Not a mass heater, just a stove. Google... youtube... Permies... doesn't matter where I search for rocket *stove* I always end up with information on mass heaters instead. I just want to be able to can tomatoes outside, not heat a house!

Rachel, I pulled your question from the discussion of Erica's pizza oven plans because I know there's good stuff here at permies.com about rocket stoves.  One of the projects for the event at Wheaton Labs (soon!) is to make a rocket stove powered canning kitchen on a skiddable sled.  I think that's in the second weekend, which can be attended as a stand alone event.

I don't even want to get into stove pipes and such, those books have all been written, and likely googling any question will give multiple discussions on the topic  

rocket stoves and plans

the images at the top show a complete rocket stove for 89$, plans for rocket stoves, etc

rocket stoves are basically the firebox, connecting tube and heat riser of an RMH, but without the bell or mass

I've never seen one with a stovepipe exhaust, maybe you could build a tee pee like structure with a hole in the center for the exhaust to escape