The kit is best made as sub assembly's:
The cross section and the four pylons with the vanes attached.
For the four pylons pin two of the 'rods' together so they form one longer 'rod' and add the vanes, it is easier to get them straight if attached at this time. Pinning the rods is necessary, without this additional strength the assembled model will be very fragile.
The pylons shouldn't need pinning to the cross section.
As advised the best aid to assembly is the picture on the website.