Waoh, thats a nice Idea
well and to "construct" such a "Mechakitin", well the powersource can be magic... if we as homins know ether a
Stirling Engine or a
Steam Engine, then a simple dagger enchanted with a Firespell and enough Sapcrystals CAN work as a powersource.
The Tryker Shockwavespell may be use directly, depending that the "Shockwave" is a concusive force and not an energy Shock, to hit a piston and drive an Engine, just enchant a dagger and discharge.
Alternativly, as us Zorai are gifted with Electricspells, a
Electrostatic Motor(uses DC, which can be build without magnets as opposed to a normal AC electric Motor) could be used, again with a small weapon enchanted, this time with a Electric(Electrostatic?) spell.
so much for driving it, the "Mechakitin" could be build into the exosceleton of a sifficently large Kitin(Kiban, Kipee or Kinrey, maybe Kipucka) and as such would look and smell like a wounded that had contact with Homins(thats why it´s wounded

)
so much for the "rationalistion" for a Mechakitin, i find that the very idea for this plot makes my head explode with ideas
greetz Lyrthis