I use old laminated posters, cut down to fit to line the pipe. As for the end, you can get end caps for PVC. I cut a round out of the poster to pop in the end and I ALWAYS tape the cap to the pipe. Don't think it won't fall off, because belive me, they aren't always as secure as you think they are. A 2kg batch of raw soap is not the easiest thing to clean off the kitchen benches, the floor, yourself...
When it's time to unmold, you just slide the poster-wrapped soap out, unroll it from the poster and there you go, too easy!
This is how I have been doing mine. I use about 18" of 2" PVC. I put a 2" cap on the end of it. The cap is rounded so you have to prop it up. I have been using the RTCP for most of the batches which may help with removing it. I then shortining the mold. I know this seems wrong but it has worked and it may work without it. One my soap has set up for 24 hrs. I put it in the freezer for 3-4 hrs. From here I put it out on the counter until the mold gets good and sweaty (20 mins) but, don't wait too long or it is a beast to get out without re-freezing.
To re-move I use a 1.5" piece of PVC with the 1.5" rounded cap on the end. This fits nicely into the 2" mold. I stand it up straight, grip the mold with a dry cloth and pull down.At times it comes out easy, at times it's a mini work out. You have to use your weight to help pull it down, but with continuous pressure it will come.
Nothing fancy but it does work. If you all want me to send pictures, let me know. Hope this helps some of you all as you have help me.