The R2 socket is probably the most annoying part of the ship, as I’m sure your aware, the droids head and arms are supposed to be telescopic all of a sudden just so that it can fit into the ship! Since I wanted to include the whole astromech i.e not just the head, I ended up using the car mud guard pieces to recreate the cylindrical part of the ship. I’m quite pleased with this area as it keeps the ship as thin as possible while still being able to house the droid. However, I fear using car pieces in Star Wars ships is becoming something of a habit! :D