This MOC is heavily based on the official LEGO set 10197. It’s an updated the design and uses new parts that were not available when the set was initially released back in 2009. The design also replaces some expensive parts with more commonly available parts to reduce the cost compared to the original retired set. The main new technique introduced is the use of part 71771 – a slope originally used with the new road plate system. It’s used as part of the wall which helps other LEGO fans find new use for this piece.