You two are awesome :')
Still though. As far as tech goes. Try not to be too future-y
I want it to be like... Medieval-y fantasy type thing. 
In case that wasn't evident. lol
For examble of tech I suggest looking into "Akame Ga Kiru" and "Ubel Blatt"
Of course their tech is more supernatural based things...
Just forget those two. 
Good manga in my opinion though >_>