Amount of time involved, including research and material preparation. Ability of entry to hold up in use. Attention to details, neatness and finishing touches. Evaluate the work as a whole. Keep in mind that this entry is at Novice Level, regardless of the skill of the entrant.
Extant pieces are ideal sources.
For pre-Medieval devices, medieval depictions are very unreliable and should be supported by text references. Must have at least 1 page, 2-3 pages preferable. More is acceptable. Difficulty and variety of tools used. Difficulty and variety of construction techniques used.