Milan.Pfannerstill answered on July 2nd 19 at 17:56
The first variant is easier and faster to do in 3D spline to create the desired shape, apply extrude and set the desired thickness of the entire surface. Continue to impose the desired texture and render it in orthographic projection (not perspective).
If you want to make the PS, then I would do all the blocks of shapes inside which would put the images you want and in the mode of the smart object would try to fit into this view. The resolution document must be set to 2 times more than then the result will be, so the image is not blurry as a result of such transformations.
In the second embodiment, the transition piece can also be made with shapes and transformation of the slice image at this location.