Roger and the guys,
The shutters although ripped to pieces didn't move from the tracks. I used 6 x3 C lipped channel purlins, with 5 1/2" nylon rollers, so they could not lift/ move out of the guide. Each shutter was 3m x 3m and could easily be moved by hand.
The basic design was good, just I didn't have the time to finish the sheeting before heading of to Thailand. Would I build the same again???? If I still had the 18" scope to house, Probably.
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