Except you forgot to add the metal 'eyes' for me to attach the cover to the rotary drier - but hey, never mind! I am delighted! I probably over estimated by dimensions by a couple of centimetres, but it fits very nicely anyway.
I have protected the top of the cover with another smaller plant pot, as this a stress point. Please save the design - next time, I'll also ask for some velcro around the sides, to also help stop the wind blowing it off.