Garden shed/ fire refuge

Hi
Like many other people i believe that there needs a back up plan for when the fire plan you initially had fails. My vision is for a 2.4m steel frame cube with compressed fibro inside and out covered with point 7mm stainless steel sheet to reflect the 90% radiated heat. These would be approved, sold through Bunnings and delivered on the back of a truck to be lowered into a shallow level trench which, with a fireproof door, would create an airtight seal.
In times of emergency the mower would be thrown out and 12 people could stay safe until the fire had passed.
I think they could be sold for about $5,000 at a wild guess.Would this be right and would people pay thet much?


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