The only thing I want to point out as someone who plays a Magitek Engineer and has done a lot of research into the lore behind it in FFXIV and other games (for inspiration) is that outside of the Garlond Ironworks no one canonically makes Magitek in Eorzea, everything is either pilfered Garlean tech or stuff made by Cid for a specific purpose and person. With that in mind you'd definitely need a good explanation and backstory for how he managed to come into possession of something like a fully functional Magitek limb, obviously it's not something you could just find lying around since it would have to be modeled after your own arm as far as measurements go. The other thing to consider is that all Magitek runs on Ceruleum, which is a fairly expensive fuel source to come by (being that it is refined crystals), so you'll have to struggle with your arm always needing a power source that can and should deplete at times. This can be troublesome, but also opens up the door for some interesting RP as well. I guess the biggest point I want to get across is that it's possible, but it'd still be a rather large undertaking to have done and should involve significant story explaining how you got it.
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