I put up my Keter plastic shed. It was a piece of cake & well designed, UNTIL we got to the roof. It felt like the designers had got bored on a Friday afternoon and thought, "sod it, it's time to go home, so let's quickly finish the design by getting them to screw the roof on". All the rest of it had custom fittings, but the roof was simple screws. Effective enough, but crude. The roof panels were about 5mm too long as well. Nevertheless, the two of us got it up in 2.5 hours and it looks good.
I might risk the Dahon folder in there, but there's no space for any other of my bikes and I wouldn't trust it anyway.