Obviously there is no text written on them (for now?). Differences to the rendering in the original client:
Depth is 2 pixels. According to my calculations, depth is 1.3 in the client, however the code only accepts integer values. And 1 pixel looked too small.
Integers are also the reason that there is no gap between sign and the wall it is attached to. But I think this does not matter much.
Obviously there is no text written on them (for now?). Differences to the rendering in the original client:
I hope the code is acceptable. :-)