Small mobile oven (Is this design feasible?)

Hi everyone, I have been busy doing some initial planning of a build I would like to start in the near future. Firstly, there are a few requirements that I have set for myself:

1. Must be small enough that I won't think twice about firing it up to cook a couple of pizzas.
2. Needs to be mobile.
3. Total width/depth must be less than 1000mm so it can fit through a gate at the front of the house.
4. Should be relatively lightweight to make moving it less difficult.

I have attached a drawing of how I would like it to look. This is what I am thinking so far:

Internal Diameter: 600mm (23.62in)
Dome Material: refractory castable
Dome Thickness: 40mm (1.57in)
Internal Height: 300mm (11.8in)
Insulation Material: Ceramic Fibre Blanket
Insulation Thickness: 100mm (3.93in)

Floor Material: Firebrick
Floor Thickness: 50mm (1.96in)
Insulation Material: Calcium Silicate Board
Insulation Thickness: 100mm (3.93in)

Flue Diameter: 150mm (6in)
Flue Height: Unknown
Flue Location: Inside oven just behind opening

Opening Height: 198mm (7.79in) based on 63% of dome height rule
Opening Width: 396mm (15.59in)

Estimated weight: 250kg - 300kg

Outer Dome Material: Considering fibreglass because it is a lot lighter than concrete render but also worried about the resin catching on fire when starting the fire at the opening. Note that the opening facade will be made of steel. Open to other suggestions.

Stand Material: Square Steel Tubing (painted)

I guess what I am looking for at this point is any possible details in the proposed build that might present a problem and that I should give further thought to before going any further. I appreciate all comments in regards to the design and choice of materials. Once I am confident that I am on the right track I will continue with accurate drawings of the inner dome and start giving some more thought to how I will build the form work for the dome.

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