Didn't think of the sunlight panels cheers for that mateNothing wrong with timber, depending on location they can be more sympathetic to surroundings but constant maintenance, needs treated every year, steel is really build and forget so appeals to me, also much longer lasting.
windows would be nice but security won for me, for the steel one I’d put a couple of sunlight panels on the roof for natural light.
5m is a minimum for me, able to get the car in and open the doors properly lol
I'll measure up 5m and see where it takes me appreciate the information