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Flue size vs. fire box/riser size.

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I have lucked onto about 5ft of 8" square box section steel about 1/4in thick.
I also have about 20ft of 5" diameter round steel pipe.
I want to build a "rocket mass heater style" heater for my workshop.
I'm planning to build it inside a couple of scrap 47kg (100lb?) propane cylinders and fill the gap
with vermiculite,with a 200l (55 gallon?) barrel over the top, then some sort of heat exchanger -
maybe from the 20 or so LARGE (6"x4") aluminium heatsinks I have in my scrap pile.

The "rocket stove book" says that each part of the heater, from fuel feed to
exhaust should have equal cross-sectional area.

Can someone more knowledgeable tell me what problems I will have if I make the fuel feed
and exhaust from 5in pipe (about 20 sq in cross section), with the fire box and riser from 8"
box section?

I want to make the heater portable if possible, as I am in the process of building a new garage.

Ever since I found this suit I've felt strange new needs. And a tiny ad:
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