A Hogwarts student (not necessarily Harry, Ron, Hermione, Draco, Luna, or anyone else in particular) is fairy simple, though you may have to order some parts from specialty online merchants like Alivan's. I found a link with some tips on this
(well, the link was dead, but that's what we have the Internet Archive for).
While I'm here, there's also all the stuff listed at this link
Oh yeah, and the sources of my screen name, Blue Mary
and Terry Bogard
from "Fatal Fury" (and its sister series, "King of Fighters") are fairly simple, too.