The rest of the Anechoic blocks can be assembled exactly the same way as Block 5. The only difference is that the fabric pieces will no longer be the same shape. That means that when you're aligning your template on the fabric, you have to be extra careful that the template completely covers the fabric.
Take a look at Block 7B - the C1 section of the template is entirely covering the blue Fabric C and the B2 section is entirely covering the pink Fabric B.
Still feeling a little unsure? Watch me make Block 7.