How does the foam reattach?
Plastic pins are inserted into the removed pieces, and plugged into the bottom layer.
Do I need to put a pin in every foam square?
No, just a few per block of foam you need to re-attach.
My case is a different size than the size listed, will it still work?
Yes, it will work with any case that has at least 3" internal height. The standard sheet size is 350mm x 550mm, so get as many as you need to fill your case.
What is the size of the foam squares?
Each foam square is 10mm.
Can I use this as a single layer in thinner cases?
Yes, however two layers are needed to be able to re-insert foam.