Hello chaps, Some customers recently have been asking for 8ft doors for built in wardrobes I've been making.. My cheeky method is a 12mm sheet of mdf cut to door-size and then i take 80mm strips of 12mm mdf and glue/pin them onto the front to create rails and stiles. From the front it looks like a panel door and on the back it's flush. When they are glued and pinned i lie them on a super flat surface (a couple of fire-doors set up as a bench) Trouble is , the pesky things are still prone to minor warping and frankly I'm unsure why... Anyone got any ideas as to why this happens or has a more fool-proof method? Perhaps 25mm finished isn't quite enough for an 8ft door? Be grateful of your comments, Cheers!!