So, on adding weep holes or channels for water to escape from the surface of your hearth is very worthwhile (sheets of mosaic tiles work really well to provide the channeling to the weep holes). Your cooking floor bricks are laid directly on the insulation board or insulating concrete layer...no refractory mortar needed here. You may need a thin layer of sand/clay mix to level the cooking floor bricks...but just a thin layer.
Most folks choose the easiest method (IMHO


I hope that helps a bit...here's a nicely documented oven base build that uses these hearth/insulation principles:
https://community.fornobravo.com/for...andpoint-idaho
Enjoy the journey!
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