About item
Can be crafted using chain and planks (custom craft, easier than is vanilla Minecraft).
3
Mostly simmilar to standart sign.
About block
There are two variations of block - side and top variant. Top variant is very close to standart sign top variant, only difference is chains in place of stand and checking up block for breaking. Top variant brake if block on top of it is broken. Side variant add pole to what sign is connected. It does not break if block to what it is connected is broken.
Blocks are very close to standart sign. It's only difference is described upper and are rendering and autobreaking.