New homemade stove design help

Hey, building a new wood stove. It will have a secondary burn system like the burley wood stove design. I have attached a pic of theirs. I will be adding a 3rd burn system at the baffle.

I have just started laying out and cutting my steel and i have a couple of questions before i continue.
stove dimensions will be roughly
16 deep
22 tall
18 wide

1. how much space is needed above the baffle?

2. how much space between the outer wall and the lip of the baffle?

3. should all the primary air come out in front of the door or should it come up under the wood?

Any other suggestions are welcome. I have attached pics of layout plus some with sharpie marks showing primary air options.