Well in the comments there was the idea that it would be useful to daisy chain this display. Theoretical the only thing which is needed is the shift output of the the first register an connect it to the input of the next. But then you would need al lot of wire additional to connect the supply voltage, the clock and the latch pin. So I came up with this (rendering from OSH-Park):

As you can the there are now additional PAds on both sides. These are for soldering two boards together. Only on the first board the ISP header is to be mounted. So multi segment display can be created.

Thanks to @Stefan Lochbrunner and @Dmm6137 for their comments.