Gazebo corners (Bretlands KT16)

Four corners from an old gazebo, plus some longish roof bits.
There are NO extra nuts or bolts and no fabric.
I keep thinking some-one might have a decent idea for the corner bits as they are quite sturdy and in decent condition, maybe for a cold frame ... ?
Hopefully, everything goes as one lot but happy for just the corner bits to be reused. I can measure if them if anyone is serious, but we all know roughly how tall these will be [around 2M], and I'd guess about 40-60cm per side