[quote=@Expendable]
Why not title this Laurentia's Run?[/quote] 

Dunno, that feels presumptuous. I'll probably overthink it way more. xD

[quote]What sort of tech is allowed, seeing how this is a merchant ship, not necessarily a merc ship with the space for mecha suits. 

Do crew have their own cabins? Share a cabin, just have bunks, or hot bunking?

Aside from caster guns and their expensive shells, what sort of personal weapons may the crew carry?

Is the ship itself armed? Are major weapons hidden? Grappler guns?

What sort of cargo is the ship taking on?

What do people wear on Earth and in the colonies? Is it all conventional? Seeing how there's magic, do some opt to wear a lot of robes?
[/quote]

Okay, in order... 
1. Honestly, I'm not going to be too restrictive. It's more a matter of "where did you get it" (although Rin'a already got the mech angle covered). It's not necessarily a merchant ship, either; it's more generalised than that. 

2. Individual or shared. The crew size is limited by the number of berths.

3. Mmm, I wasn't thinking like Outlaw Star levels of cost there – more that they're like the #4; use is gonna be restricted by being draining to the caster (and not all wave motion guns). Personal weapons... well, the tech level available is widely variable. Coilguns more often than gunpowder, but energy weapons of various degrees of reliability, complexity, and damage, or just go for some form of melee weapon with the same logic.

4. Yes, it's armed, but not super heavily; it ain't a warship (or pirate vessel). No, it does not have arms xD

5. Depends what the job is. Generally gonna be more value-oriented (or speed) than bulk freight; not the room for that.

6. Honestly, whatever; the galaxy is huge and fashion is going to be dependent on where you are. Earth proper? Well, take a look at the world NOW, it's not gone any less varied.

But the navy does go in for the retro naval look (this is not a coincidence), I like that.