Edit: I want to stress that the method I've used is based on Marit's tutorial found here
This post is going to be picture heavy but please beare with me while I post picture after picture that was taken while sewing one of the blocks together. In fact, it'll probably end up being split into more than one posts.
This particular quadrant of the spiderweb has yellow in one corner and red in the other. So, I've marked these corners with their designated colours, in pencil. After pinning the centre piece securely in place, place a yellow strip face down (right sides together on the grey) on the side marked yellow. Sew this first seam through the two layers of fabric and the paper.
Then turn the quadrant over so that the fabric is face down and the paper side is up so you can see the stitching line.
Fold the paper back on itself, on the stitching line and then flatten it out again. I do this fold at this stage because it makes the next steps easier.
Place your next yellow strip face down on top of the first yellow strip making sure that some fabric goes beyond the edge of the paper tempate/foundation.
Pin the yellow strips together read for sewing but make sure that you do not pin them onto the paper.
Once you're happy that the strips will adequately cover the paper when sewn and opened up then pick up the pieces in your one hand and using your other hand, fold the paper away from the yellow strips.
Lay your pieces down and sew the second yellow strip to the first one. If you look at this picture you will see that the piece you folded away/tucked under, is jutting out at the top left corner, ensuring that you only sew through the layers of fabric and not the paper.
After you've sewn the second strip fold the paper out flat again so that you can place your third yellow strip face down on top of the second yellow strip.
After repeating the process of folding/tucking the paper away, sew the third yellow strip to the second one. Repeat adding and sewing yellow strips to each other in this way until you have 'covered' all of the paper for that area.
When you turn it over, fabric side down, you will see that the only seam that has sewn through the paper was the very first seam when you sewed the first yellow strip to the grey centre piece.
As this really is picture heavy, I will continue with the next part [tomorrow] on a separate post.
Hope this helps. If you have any questions or if anything doesn't make sense, please ask and I'll try and help.
In the meantime,