Bench for a rocket stove

Hello everyone. First time posting here. I have some work ahead of me and wanted to get some good constructive comments.

I have a straw bale house built on concrete piers and have built a concrete foundations for the stove and the bench that would go along with it. First plan was to build a brick batch box rocket heater but unfortunately I am not able to do that now. It would have been a 165 mm size with a 180 mm stainless steel chimney that I already bought. Since the batch box is not an option now, I would like to replace it with a metal 150 mm Gamera 7 rocket stove, connect that stove to the bench and the chimney and maybe one day, if  there will be an opportunity, build the brick batch box rocket stove.

I'd like to describe all the parts of the system and if anybody has any kind of comments, it would be very helpful since I am basically a complete beginner regarding stoves.

So:

1. the metal rocket stove (blue circle in the drawing) is nominated at 14 KWh, 150 mm diameter exhaust.

2. The bench would be around 2,25 meters long, around 50-55 cm deep, and around 40-45 cm high. The duct pipes would also be 150 or 160 mm diameter. The outer wall of the bench would be build with bricks 6,5 cm thick and then plastered outside with ~1-2 cm clay plaster. The inside space between the duct pipes and the wall of the bench would be filled with cob.

3. the chimney is 180 mm in diameter. I already purchased this so hope the size isn't too big. It's stainless steel, 316. It was a good discount. 2,5 cm insulation around it. 6 meters high.

4. The green square underneath the metal stove would be the place where in the future a possible batch box stove would be built.

My main questions are: are the stove, the bench and the chimney compatible to get a good functioning system? And also, will I be able to build a masonry batch box in the future, if I chose to? Is the 93 x 80 cm enough space for it? What kind of material should I use for the duct pipes? Stainless steel or galvanized steel? Something else?
Also, what kind of floor insulation should I put underneath the bench and stove? Between the concrete foundations and the heating system itself. Currently, I have poured the concrete as a base of foundation, but since my house is 50-60 cm above the ground I still have opportunity to make plans while building everything up to the floor level where the stove and bench start. Am definitely putting bitumen hydroinsulation before laying concrete blocks to get to the adequate height.

I didn't draw any cleaning holes for the duct pipes. I guess at the other end of the bench, opposite to the stove, would be the best place? And I don't have any bypass from the stove to the chimney. Is that necessary to start the fire? I see there are stainless steel valves available to buy, with a simple on/off function.

BTW I live in continental Croatia on a hill, almost at 300 m. The border with Slovenia and Hungary is few km from my place.

Thank you everyone for your time. I included a drawing of the whole system + a photo of my house, the wall, where the stove would be. I think I would also have around 15-20 cm space between the wall and the stove. Hope everything is clear.

I can post a link to the stove I just purchased, if it's permitted. I added the photo for now.

Luka

Hi Luka.

93 cm pad length will be almost enough to squeeze fi150 BBR there, but not more. Firebox length would be around 700 mm Bricks in Europe are usually 120 mm wide so 700+240 would already put you over your 93 cm. You also need to add 10 mm gaps between firebox and the bell. I would suggest extending the slab while you can. For fi 165 you want 1100 mm and another 200 mm so the exhaust gases will have unobstructed path to the chimney exit. So 1300 mm deep, assuming you will keep 800 mm width.
At this footprint, the bell size will be around 2 m tall assuming a system with no bench.

Nowadays benches are just open bells without any piping. Cheaper, easier and better following the principle of free gas movement.