Thanks Tony,
I must apologise, now i've put my glasses on I can read the writing on the drawing ! I did initially dismiss the drawing as the wrong one thinking the poles for the blackout curtains was another set of main poles.
I have none of the vehicle attaching poles, nor do I have the one vertical pole against the vehicle side. I do have 4 of the wire rope tensioner cables, but as you say they are not absolutely necessary.
I will get all the spiders and poles out next weekend and do some measuring.
Here are some pictures of the numbers on the canvas parts.
John.