

If it is within reason for your game, it is, in fact, RAW and can work fine. If this build is likely to be overpowered, consider applying the errata to magical lineage to Wayang Spellhunter as well, as e.g. Note as well that shocking grasp is one of the weaker options for this combination- it just does melee damage- and that every spellcaster can have at most one spell specialized in this way. You should consider denying it on the basis of game balance, or suggesting/allowing your other players to use similar exploits. Running this trait in accordance with the rules makes it much more powerful than most other similar traits. Just because the rules say something doesn't mean that is a good idea for your game. In combination, the two can indeed lower a +1 spell level adjustment metamagic to -1, which can indeed make a 1st-level spell a level 0 spell, which, for some classes including the Magus, gives it special properties unique to 0-level spells (like not getting used up when cast).

Unlike Magical Lineage, Wayang Spellhunter was never errataed to prevent spell-level lowering. To become a good mechanical design engineer, first, you require a degree or diploma in mechanical engineering.That will help you in improving your basic knowledge in the mechanical field.
