Inner Door Cards

I would guess that they are glued on. When I removed my door cards I could not see screws on the backside, but my memory might be faulty

 

The inner section is not removable, it is part of the overall mould of the door card. The door handle can be unscrewed but the net pocket frame is heat welded to the door card - these heat welds can be broken from the back by careful use of a sharp knife and then the net frame can be popped out. Once the net pocket has been removed, the upholstered middle section can be pulled off. It is held on with glue so will take some effort and then some white spirit to soften along with some scraping to get this section free of glue traces. If you are re-upholstering this middle section with leather, I recommend covering it evenly with double sided tape and then careful placement of the leather, starting along the high ridge and then working the leather out towards the edges. To avoid the leather sticking immediately and to give yourself some time to manipulate it into the desired position, spray the tape/glue with water as you go along. Tucking the edges into the space between the inner and outer sections is the final stage. Do not use a liquid glue unless you are an advanced and skilled upholsterer. An even spray glue would work if you get the right product but any liquid glue could easily soak in and spoil the leather. When reassembling the pocket you will need to glue the previously broken heat welds back into position with a strong bond such as Araldite. Good luck with this job, it's not an easy one and will take some considerable time to get right.