It would be made of multiple parts in the carpentry building like a shield, but rope would need to be attached, then a sight could be made at blacksmith with the player being able to get sand/ using sandstone in the blacksmith to make glass to put in the sight.
Instead of arrows, bolts could be made as well in the carpentry building.
The crossbow would be much more expensive to make but much more powerful and able to be used with bow and arrow skills, with skills requiring you to hold the bow back being turned into skills that require the user to hold down the trigger