Once i have created the dome/tunnel i will need insulation. my research shows that thermal wool insulation VERY expensive.
The other day I found a home water heater on the side of the road and took it home, once i opened it up i found some GREAT foil covered "wool" insulation and large enough to do most of the pizza tunnel
I then stripped it of the f
oil/wool and it ended up being around 1.8metres high by 1.5 metres wide.