It says in their destruction booklet that it invalidates it but the storm kit is avaliable they have a list of do's and don'ts
Sorry, but I had to laugh a when reading your typo here. You're clearly not pleased with this awning are you?
Yes I can see how using certain storm kits would invalidate the guarantee if they fitted over the canvas and thus abraded the canvas. But someone else posted here that their own make of storm strap passes under the canvas...perhaps you've misread the dos and don't here and they meant using storm straps other than their own invalidates the guarantee?
As for where to attach the guy lines, don't they go over the spikes at the top of the awning poles? Were there guy ropes suplied with the awning? If so, you're presumably meant to use them.
Other thought...you did peg it out round the bottom, yes?
As to running around half naked in the middle if the night dealing with a tent in a storm...been there, done that. I remember being out in the Loire storm of 2002 (massive damage down the length of the Loire valley)double guying out the awning of our trailer tent while dressed in my nightie and dodging flying branches and twigs, eek.