I also fell into the same trap. Saw a Q4 in the showroom with the variable floor, couldn't see it as an option on the parts list so thought it came as standard, and then discovered that it was missing.
I went to Audi and asked about retrofitting. He said he would email Germany which could take 3-5 days. Then if it's possible, it might take 10-14 days to order the parts. His own guess at the necessary parts list was about £700+labour. I told him I had the parts list provided on this forum, but he wasn't interested. So instead, I went to the VW parts store, and ordered all the parts for £260 inc VAT. They all came with next day delivery and I've managed to fit it perfectly myself. Still waiting to hear back from the Audi guy lol!
I didn't take any pictures of the before, but if you're reading this forum, then you already know what that looks like. Here is what mine looks like after I finished. Looks like a factory fit if I didn't know better.
I have an Audi Q4 e-tron S Line 40 with the Comfort and Sound Pack. MY22 ('71 plate). UK spec.
When installing, I wanted to be sure that there are actually screw holes in the chassis before I made a hole in the felt lining, so I pulled the lining away from the car enough so I could see behind it to confirm the holes were there. After that, I didn't want to ruin the lining making the holes. So I used a sharp knife to make an incision, like a crosshair (vs cutting a circular hole). That way I could push the bolt through, but given my car is a lease, when I give it back, if I remove the variable floor to sell it privately, the lining should pop back into place, and you would never know I made the holes! Also, I discovered you don't really have to screw the furthest back screw on each side in. The plastic shelf is sturdy enough by just putting the first 2 screws on each side and using the 2 plastic spikes at the front (on my car, the holes for those plastic spikes were all there)...if you're doing DIY, then this makes it easier overall. There are no electronics to touch in this job.
If you're handy and confident you can definitely do this yourself. All you need are the parts, the correct tork screwdriver, a sharp knife, a small round corkscrew or similar to make the incision a bit bigger so the bolt fits through, and some daylight.
I'm not a qualified mechanic...just a DIYer. I don't mind doing this for people for a small fee if you're willing to come to me (NW7 - north west London). Just send me a PM.
