I got my mini-lop when he was 10 weeks, and the litter training issue was a big one for a while! He eventually learned to pee in the right place, but once puberty kicked in he decided that he would, in fact, like to pee wherever he pleased - and did. Often. He had always pooed all over the place, possibly as a wee territory thing, but after i got him neutered he was completely different. He now pees and poos only in his tray, and this has to be in his cage (if i leave the tray out for him he'll jump back in the cage and wait for the tray...).
Unfortunately, any pooing problems may not be easily controlled until he is neutered. But at least he's not peeing everywhere! Small mercies...