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Learned a ton reading threads here. Saved my arse on this first build. My question is regarding my plan tto put the fire box under the tank as shown. Is this a bad idea?
If your committed to the idea maybe only make a large enough cut out on the far left bottom of the tank for airflow so the tank will act as a baffle plate.
If you have rectangular cut out on the bottom of the tank where the firebox is recessed up into, and add a flat top on the fire box , that should work.
The flat top on the firebox would prevent direct impingement of the heat onto the reverse flow plate.
You would not have the sides of the FB following the coutour of the tank: it should be totally enclosed with an opening only on the right side. Pretty much as your drawing shows.
That was my goal, want it to fit in the garage and be easy to move around. Hopefully the heat shield plate below the RF plate will help control the heat. My legs will never be cold!