Design help for hot air circulation - Heat exchanger

I came across a video of a barrel stove with heat exchanger pipes over the flames. I was curious if it could be redesigned into a rocket heater keeping the pipes, yet given the rocket stove benefit of not using to much wood. And if so, what is the best design? I thought since the hottest part besides the firebox, would be the heat riser core. Maybe integrate the pipes within somehow.  

I’ve got a shop that I plan to heat up using the heat exchanger pipe method, with a blower pushing air through the pipes. Trying to push the heat off the unit much better.

I was wondering what kind of pipe material would be sufficient to withstand the extreme temps?

Video: https://youtu.be/RXY0JKU12jg

Hi Jonathan; Big Welcome to Permies and a big welcome to Rocket science!
Quite a nice stove in that video.  It obviously warms that incredible play shop they have very well.
It is nothing like a rocket stove though.  He is letting HUGE amounts of heat up and out his chimney...  He isn't mentioning how much wood he burns.
On a rocket mass heater, you should be able to lay your hand against the exhaust pipe as it leaves the room.  That means all the energy that was contained in the wood is now heating your room...
In the video his pipe was 700F... that is a whole lot of energy being sent up the chimney!

So having said that let me touch on your idea.  There is a pipe capable of being inside a rocket stove over not in  the riser.
That pipe comes from rolled alloy and is called RA330 . It is capable of withstanding temps of 2100F continuous... Batchbox rmh's run right below that temp in the riser.
Any other steel will spall and disintegrate in one or two seasons if not one or two months...
It also is crazy expensive! As an example . In my rocket stove store I sell an 8" piece of RA330 delivered  free...   I charge $90 for it and I am not making much profit at all.
Imagine the cost of 30-40 feet of that to build his stove...

So I would like to suggest that you build a 7" batchbox  with a brick bell and a double barrel system.
I have exactly that in my poorly insulated auto shop in northern Montana... I wear a tee shirt out there now and before when I had a old style double barrel stove.  My barrels could be glowing red and across the room a metal wrench left sitting would stick to your hand!  

The whole idea of a RMH is to save and use all that energy and not send it screaming out the chimney!