That's marvellous, Jochen, and the young lady who commissioned you must be delighted, as well as her boyfriend. The attention to detail with the record sleeves and turntables is incredible, as well as the work done on customising the figure.
I expect you will now find other "commissioners" contacting you.
PS: On your point about there having been DJ customs in the past, this doesn't matter as not only is yours different but when someone creates a custom they may do so without knowing of similar customs created already. The fact that there is already a custom DJ or a particular custom of a fire engine, say, doesn't mean that other people who do similar customs have copied them. They may not have known of them or may have been inspired by them.