Just if your interested how I did the slight difference in height. There might be different/more sturdy solutions but Lego windows and coins are always a nice way to lift things up just slightly.
The main part of this "technique" is to carefully place tiles and rocks, beginning from one end to another.
Some extra words, cause I think it fits in this case: I had one or two(unsure about that) Bricklink orders in 2018, none in 2019. In this case I ran out of dbg curved slopes, so I decided to add some rocks in lbg. Just want to mention: BL is great, but sometimes check if you really need the order or try out alternatives to manage a build with your current collection.