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A peek at my first 2 RMHs, question about next one

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First post from me. Hello!

This was my first RMH build. Heated a 12 sq. m. cabin wonderfully, but the flue exited top back, so in hindsight it was quite inefficient:

Second one for a steam room / sauna; same design as first, but bigger burn chamber; also works excellently:

Third project on the cards and I want to increase efficiency by adding a brick bell. Here is my extremely technical drawing:

I have played with the firebricks for the riser; imagine a brick bell on the left, as in the design drawing:

Here is the burn chamber:

Is the hole at the top of the riser big enough, or too big, for the push into the brick bell?

Good night. Drive safely. Here's a tiny ad for the road:
Rocket Mass Heater Plans - now free for a while
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