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Hybrid RMH Idea

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Please forgive me if I'm heading down the wrong path or should be able to answer my questions with the googles.  I've done a fair bit of reading/thinking but sometimes the best approach is to just bounce ideas off of people who know more than you do

I have a large workshop / garage of about 2400 sqft that doesn't have heat.  We live in the Santa Cruz mountains so it never gets crazy cold, but winter's coming and it's nice to be able to work without shivering.  I'm thinking about building a heating solution for the shop.

Biased as I am toward using stuff I have lying around, I'm considering using an abandoned 80Gal vertical air compressor tank as the body of this heater.  It's abandoned because it developed a small crack that I welded up, but ultimately decided didn't really make me comfortable in compressed air service.

I don't have the space to build a sizeable masonry thermal store the way one would in a residential setting, so I'm contemplating a hybrid system with a small thermal store to act as a bit of a thermal capacitor and then a fair bit of radiating surface for direct heat.

Images attached.

The concept would be that the square block section around the burner would be steel filled with sand, and that above that would be radiating fins.

Thoughts?  Is the thermal store even worth it at this size?  How do I size the burner, inner "up tube" and chimney out relative to the diameter of the compressor body (24")?

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Location: Southern alps, on the French side of the french /italian border 5000ft elevation
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2400sqft, go batch. A J won't do much.

I would do something along Peter's redbell. http://batchrocket.eu/en/applications#redbell

But with a double bell, one metal, as the usual barrel. Your tank will do fine, and i would build a brick tower, to store a bit of heat.

This is my workshop heater.   http://donkey32.proboards.com/thread/1817/starting-build-220mm-rocket-double

You see, i prefer square barrels, than round!

And for the mass tower, may be along the shape of this one?

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