u/Consistent-Bad3398

I have a 4" x 6" polycarbonate greenhouse. It's on a concrete slab, covered by weed sheeting on a gravel grid. The greenhouse has 4 legs and I want to keep the height so there's space to stand properly.

Doing some research, a timber or brick skirting to handle the gap between the legs would work. Anyone have any suggestions which might be best?