There are 17 frames to erect and each frame takes about 3 hours to position correctly and about 3 hours to fasten off to the vertical columns
The first two frames (entrance to garage) took me 15 hours on my own to line up perfectly.
We had moved the central column 10mm to one side in order to accommodate the slightly out of spec frames - turns out the one side had a distortion of 20mm at the top.
If we had fixed that then there would have been no need to move the central column.
Ended up having to cut and reweld the noggins on either side.