BOM
Ply wood 4x8' Homedepot
Scree house  for material of mesh, rod etc.
2x4 2
Fleece 2
Megnets  ~100. Buy from Aliexpress
Curtain rod  from Ikea
Duct tape
TOOLS
cutoff saw, circular saw, jig saw, drill, ...
Skill: medium+ 
Length:200cm
Head room (highest):100cm
Weight Chang: Reduced >50lb (Yes I'm not wrong, it's Reduced)
Because it is lighter, better fuel economy, I keep it on all the time if possible.