DIY Greenhouse on wheels - part 3

A greenhouse on wheels may sound like a crazy idea but I had to make it happen. Follow the build process in this series.
About the greenhouse.
Length 291 cm
Height 213 cm
Width 100 cm
Indoor height 183 cm
Max load wheel capacity: 600 kg (100 kg/wheel)
Approximate greenhouse weight: 150 kg
Max load weight: 600kg - 150 kg - plants - human = no problem
Cost:
Greenhouse panels and windows was free because of recycled build material.
6 wheels: 60 $
Wood: 200 $
Other things: 140 $
In total: 400 $
Time:
Did not count but several hours during the summer of 2018.
Location:
Sweden