I got a bit carried away with the design after I it was simple.
It's not a crap host hat relies on crystal, it's a crystal boat. Keep in mind his is supposed to be after the Crystalworks. If it works then crystal will essentially just be another type of metal. Ships are made out of meta, wood, and now, they can be made out of crystal.
I'm not too sure about weapons inside the ship. It's a small thing but it does add to complexity regardless. But if others think it's necessary we could definitely have the weapons inside.
Crystal wiring disappearing is something which I still want to get another verdict from Evicted in its current state, and if we get permanent crystal then it shouldn't be a problem. Worst case scenario, just say "the steam engines are powered by Magegems input directly into slots on the engines."
HA1s is ambitious but it'd mean we could field extra-LOS weaponry st sea. It depends on the actual size of the HA1, but I'm seeing the Crystalclad as a really big tank-like ship. Carrying one HA1 seems within the realm of possibility.
The thing is, it's all possible. We're making a boat primarily out of crystal, making it bigger, then adding (maybe) Magegems. Like I said, the hardest part is just making a bigger boat. And that really shouldn't be hard, especially when we'll hopefully have a factory dedicated to making crystal. It's not like we're inventing new weapons or propulsion or crystal or anything in this boat.
EDIT: @Helmacon, an AAA Magegem has extraordinarily low amounts of power. We'd have to use bigger more expensive Magegems (they're easily handheld though) or revise the gems to have more power.
Making an AA powered rifle could be possible, but I'm honestly not too sure it'd have that much of an effect.