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Suggestions for outdoor fireplace

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Hello! I am currently studying sustainability at a school in Sweden. Me and my fellow students have have built a circular "outdoor room" with a fire pit in the middle. The room will eventually be covered in polycarbonate plastic (it has a "dome roof") and also most likely be covered with a hood/chimney to prevent any smoke from accumulating "inside" and to prevent soot from reaching the plastic roof.

What we want (most important on the top):
- A nice place for outdoor gatherings
- Warmth from the fireplace in the fall/winter/spring
- Possibility to cook food, boil/fry on the fireplace
- To use minimal amount of wood for the fireplace

What we have
- Firewood (twigs/branches from our garden/leftover wood from construction)
- A rusty J-shaped rocket stove
- Students with willingness to learn and ability to work =)
- Some welding skills and metal for construction

I have seem many designs online but haven't quite got my head around how they work or more sceifically how I can incorporate all/most of our "wants" for the fireplace using rms/rmh. If necessary we could have one solution for cooking and another for heating, eg a rms that is lifted into the center of the fireplace when needed, but that solution is not ideal.

See attached photos.

My questions:
1. In a rocket mass heater with exhaust going "up/down/out" - how would you get such fire started? Do you need mechanical venting to get it started?
2. Can I use the rusty stove somehow?
3. The rusty stove doesn't have any lid for the wood intake, is that needed? Most rocket stove designs I've seen has a lid on a hinge on the J-end of the stove.
4. Some j-shaped rocket stoves also has an adjustable lid on the air intake on the L-end of the stove, is that necessary?
5. The rusty rms has a loose part I cant figure out how to use, where would it go?
6. Can I safely try out the rusty rms? Is has only surface rust, no holes as far as I can see.
7. Why is the J-shaped stove so tall? Will the tallness affect the burning somehow?
8. Could I exctract heat from the rusty stove by adding say some piezo electric fans? Ok maybe not ideal outside but anyway.
9. Do you think rms/rmh is a good fit for us?

Any other suggestions/thoughts?

I am new to all this so bear with me, Thanks!
Rusty stove made by previous students
Rusty stove made by previous students
Rusty stove with unknown loose part
Rusty stove with unknown loose part
Outdoor room with fire pit
Outdoor room with fire pit
Ourdoor room with dome roof
Ourdoor room with dome roof
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Hi Emil,

Welcome to Permies
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