Enhancing an artificial body

Artificial bodies can be magically enhanced, much in the same way a weapon or piece of armor can be, in addition to standard bodies. An artificial body can have a total of 5 stages of enchantment.   Raising AC - Enhancing AC must be done in stages, strengthening the magic each time.
Stage 1 (+1): Starting with a magical enchantment and design that must be physically carved into the artificial body. Requires 2 workweeks & 2gp worth of supplies.
Stage 2 (+2): Details are added to the engraving, from paint to exotic metals and gems. Requires 8 workweeks & 20gp worth of supplies.
Stage 3 (+3): The level of detail must reach exquisite heights, putting forth mastercraft skill to the artificial body, making it a work of art. Requires 15 workweeks & 200gp worth of supplies.
  Raising Ability Score
Stage 2 (+1 to any ability score): An intricate and elaborate sigil must be engraved with exotic metals and gems. Requires 5 workweeks & 20gp worth of supplies.
  Imbuing a Spell - Cantrip is lv 0, max level allowed is 5. Proficiency bonus must be equal or greater of spell level attempted.
Stage 1 (Imbue spell 1/day): An intricate and elaborate sigil must be engraved with exotic metals and gems. Requires 1 + (2*Spell level) workweeks & 5 + (5*Spell level) gp worth of supplies.
Stage 2 (Imbue spell 2/day): The sigil must be enhanced with even more exotic metals and gems, and additional layers are added. Requires 1 + (2*Spell level) workweeks & 5 + (5*Spell level) gp worth of supplies.
Stage 3 (Imbue spell 3/day): The sigil must be perfected with a final flourish of the most exotic metals and gems, and a final layer is added. Requires 1 + (2*Spell level) workweeks & 5 + (5*Spell level) gp worth of supplies.