Hi there! I’m about to make a Coldframe from scratch. I’ve manage to get hold of some concrete blocks and two DG windows; I should be OK with the building of it. However, Q1. What does the frame sit on? Is it best on soil, concrete, brick, wood? Q2. How big should it be? I know the size of the DG windows ‘100 x 60 cm’ will determine the actual size but, is this to big / small and what height I’m I looking at. Any info would be most appreciated. Thanks DD.