You can buy the extra thick set of blades for the slot machine and a guide so the blades don't wander. The thicker blades are for the flat plastic hinges. For hinge pins there is a guide too that comes with two addapters for different sizes of drill bits.
AC, I do have one of those store bought sanding blocks with the different angles for TE and LE edges, almost never used but it does come in handy once in a while. I just used it on the Swoose builds to round over the LE on the stabs. By making my own sanding blocks from scrap wood you can make up a bunch in different sizes. A nice long one is great for sanding down all the wing ribs so they are all one size.
Some people like those foam sanding pads too. I didn't care for them but it could have been an operator malfunction?