Almost done with the build.
Added Styrofoam insulation, polycarb heat reducing roofing, and a gutter in the middle for water to flow to the sides.
still need to add insulation to the walls and seal the corners, but had first light tonight.
video of a soak test. passed with no leaks.
https://youtu.be/oYGAg8QjEHI
Regds
Alistair