We recommend that your base should be no smaller than the floor size of the new greenhouse and no more than a few inches larger.
Dimension A = 3770mm
Dimension B = 2530mm
Dimension C = 620mm
Dimension D = 660mm
Dimension E = 2530mm
Overall width from side to side (A) = 3770mm
Overall depth from front to back (B + D) = 3190mm (2530mm + 660mm)