How to build a Greenhouse
1: Introduction, Description, Position
2: Sizes, Angles, What you will need
3: Making the base
4: Making the side wall-frames
5: Making the roof sections
6: Erecting the side walls and roof
7: Making the end walls and doors
8: Making the window, The cover
Appendix 60° and 30° Angle patterns
Appendix Photos of finished project
Step 2. The side wall-frames
Construct all the framing out of 1 1/2"x 3 1/2" (90mm x 45mm) treated, or natural decay-resistant lumber.
On a flat surface, make up the two side wall frames to the dimensions shown in the above drawing.
Make the diagonal measurements equal (in the same way as with the base in Step 1), and when the frame is square, cut and fix the bracing members in place. (See above drawing.)