I create a New gig and this is new concept. A lot g graphic designers are now doing this.
This is a book mock up design gig. It means buyers will supply supply 2D cover design and we can convert in to 3D.
You can find this kind of gigs by searching " 3D Book set design "
If you are interesting you can follow my gig concept
If you need any help regarding in designing, I can help. Just comment.