may i just point out that this, being minecraft, doesnt really have any particular 'setting'
it isnt 'Medieval' or anything like that
just because your using swords and bows doesnt mean anything
i mean you can have redstone circuits and things that are more advanced than any medieval technology
as to airships not fitting into the game have a look at 'Divinity 2: Ego Draconis'
there are swords there, bows, portals into a hell like world... sound familiar?
there are also airships. big wooden ships that look great. and they fly.
they dont ruin the game at all.. it doesnt try to be realistic because if it did you wouldnt play it.
this is how minecraft should be: creative, new and Fun!
so before you post something about it not fitting in with the game remember that the only thing that wouldnt fit well with minecraft are people that put limits on it.