I would like to think of scratch built as "all parts that cost less to build, than buy an equivalent are built". This means items such as hardware, pickups, tuners, and the bridge are all built. Items such as screws, magnets, (possibly) frets/pots/jacks, and wire are excluded as "non-cost effective" (or just too darn hard to fabricate). I know this is unrealistic (in most cases), but it's just my philosophy. Nothing is "truly" built from scratch, unless the wood is grown and harvested, the metal is mined and treated, magnets.. (something), tools built by hand, electricity generated, air created.. etc. The original definition of scratch was "Building something from nothing". This is impossible, so it's used as a figure of speach to describe the amount of detail included in an object. So, obviously, in different cases, the meaning must be altered.
AS for how this applies to our GOTM, I think it would be wise for a mod to draw a fine line through the seperate levels of scratch.
Sorry for this rant, and if I stated anything previously stated, sorry from the bottom of my cerebellum.