A building for a stockpile would make sense for certain items. You would need to build storehouses for many plants and preserved meats, the logs and such would recognize the construction of such a building.[snip] Back to food, a building could serve to hold double what could be held per tile without a construction. Not only would you have barrels but it's not uncommon to hang carcasses, cheese, certain prepared meats and various plants from the ceiling. That would be another step closer to representing the preservation of your foodstuff.
Sort of. Having some food preservation options like salting, drying and smoking (maybe in the farmer's workshop until workrooms are implemented) would be good; having a "rack" furniture item wouldn't be bad either, if it let you double the storage capacity of each tile you build it on, via being able to place things "under" the racks.
I could see the Kitchen-as-it-is being replaced with some kind of food-preservation workshop as well, like a Smokehouse or what-have-you, requiring one or more racks and barrels and letting you smoke, salt, dry and pickle, and taking over tasks like Render Fat - kitchens should be turned into a more on-demand sort of workshop linked to dining rooms (ie, dwarf goes to the kitchen with a meal request, a cook prepares the meal from ingredients and then the dwarf takes it to the dining room). You could also have an Oven or Bakehouse-type workshop that produces more long-lasting foods for on-demand eating like bread or biscuits, and roasts for special occasions. (That's been gone over in more detail elsewhere though).
I don't know what you would construct to hold stones, it makes sense to me maybe if they were outside and were carved they could suffer quality degradation(this could apply to metal).
Doesn't really make sense to me at all. I don't think it's particularly necessary. What you could do is allow some items to be stacked or piled rather than binned - I'm thinking blocks, logs and full bags here. That might be best handled with the stacking fixes.