Hey Dasius,
It would be great to see a storage area for things we order ahead of time, perhaps make use of the various cubby holes and shelves in the shop. That way when I order 5 one hand grips they are placed somewhere I can access them easily and I don't have to collect all my items off the ground. I am not sure if you intended for your end users to have to do everything that way with the ordering system or not. Just a suggestion ;)
Also I think a sale rack for us to display items we make would be great, what I mean is I like to create things ahead of time and if I have an item that I want to sell to anyone it would be cool if someone could walk up and purchase an item I have on display and place an order as well. Perhaps in the future we will have customization options for engravings and things to make special items we can sell freely on the counter or on the walls of the shop. Maybe if you do this I can decide on days when I stay closed and restock my already made tools and weapons.
One last thing would be implementing a date and time indicator, that way if we want our shop to be closed on say Wednesdays we can do that. Maybe include it on the sign out front, something like operating hours for the shop. Maybe that is not historically accurate I just like the role play feel of it all.
Again, this game is great it is always something I wanted from a video game and I am glad to see that someone talented like yourself is taking the time to make a game, that by the time it's finished is going to be something amazing.