Why not go with Maple's bow or crossbow? Guns shoot in a straight line since bullets are at high speeds. Cannon would be more logical too since cannon bullets are heavier in size and are influenced by gravity like arrows.
You might considering recolouring the swords and axes to be more logical because of the materials used in crafting.
I assume you are not re-modelling the texture pack so I reccomend recolouring the original minecraft texture pack. HD packs would be even better with the help of MC Pack/Optifine to run it in game.
There are a lot more considerations such as biome colours, weathers, etc. Volt might be interested in this project too. I'll provide you a list of editable stuffs if you require.
Wow great that you already created so many nice things. Your work looks really great and I hope that you design a lot more things in the future. By the way I would also like to see pictures of Grasses and flowers. Can you share this? I am totally fond of flowers and I will now go and use serenata flowers free delivery transport services. Already looking forward to some fresh flowers and your work.